Exactly the same sketch, same programmer, same serial.
On Arduino IDE it works and loads the program
On Visual Micro it does compile but does not load the program with a lot of errors.
Here the dump

Compiling 'LedTest' for 'Arduino Pro or Pro Mini w/ ATmega328 (3.3V, 8 MHz)'
Build folder: mega328
Summary: Header=1 Prototypes=3 Imports=2
Additional Defines:
Architecture Tools: C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/
Sketchbook: file:///C:/Users/Massimo/Documents/Arduino
Core Include Paths
Include Path 'C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino'
Include Path 'C:\Program Files (x86)\Arduino\hardware\arduino\avr\variants\eightanaloginputs'
Library Include Paths (1)
Include Path 'C:\Users\Massimo\Documents\Arduino\libraries\AltSoftSerial'
Platform Libraries Root Include Paths
Include Path 'C:\Program Files (x86)\Arduino\libraries'
Include Path 'C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries'
Include Path 'C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\Extensions\t5mynzxg.y1e\Micro Platforms\default\debuggers'
Include Path 'C:\Users\Massimo\Documents\Arduino\libraries'
All import libraries will be re-compiled
"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD -mmcu=atmega328p -DF_CPU=8000000L -DARDUINO=165 -DARDUINO_AVR_PRO -DARDUINO_ARCH_AVR -I"C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino" -I"C:\Program Files (x86)\Arduino\hardware\arduino\avr\variants\eightanaloginputs" -I"C:\Users\Massimo\Documents\Arduino\libraries\AltSoftSerial" -I"C:\Program Files (x86)\Arduino\libraries" -I"C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries" -I"C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\Extensions\t5mynzxg.y1e\Micro Platforms\default\debuggers" -I"C:\Users\Massimo\Documents\Arduino\libraries" \LedTest.cpp" -o \LedTest.cpp.o"
"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD -mmcu=atmega328p -DF_CPU=8000000L -DARDUINO=165 -DARDUINO_AVR_PRO -DARDUINO_ARCH_AVR -I"C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino" -I"C:\Program Files (x86)\Arduino\hardware\arduino\avr\variants\eightanaloginputs" -I"C:\Users\Massimo\Documents\Arduino\libraries\AltSoftSerial" -I"C:\Program Files (x86)\Arduino\libraries" -I"C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries" -I"C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\Extensions\t5mynzxg.y1e\Micro Platforms\default\debuggers" -I"C:\Users\Massimo\Documents\Arduino\libraries" "C:\Users\Massimo\Documents\Arduino\libraries\AltSoftSerial\AltSoftSerial.cpp" -o \AltSoftSerial\AltSoftSerial.cpp.o"
Build Core Paths: C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino
"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-gcc" -w -Os -Wl,--gc-sections -mmcu=atmega328p -o /LedTest.elf" \LedTest.cpp.o" \AltSoftSerial\AltSoftSerial.cpp.o" /core.a" 28" -lm
"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-objcopy" -O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0 /LedTest.elf" /LedTest.eep"
"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-objcopy" -O ihex -R .eeprom /LedTest.elf" /LedTest.hex"
Binary sketch size: 6,386 bytes (used 21% of a 30,720 byte maximum) (1.59 secs)
Minimum Memory Usage: 424 bytes (21% of a 2048 byte maximum)
.
Tutorial Mode
.
The usb debugger has been activated in 'Automatic Debugging' mode. Switch off this feature? Untick 'Tools>Visual Micro>Automatic Debugging'
Any one of the following will stop the debugger:- Ctrl+F5, the blue square on the serial port tool bar, untick 'Connect', building the project.
.
Compiling debug version of 'LedTest' for 'Arduino Pro or Pro Mini w/ ATmega328 (3.3V, 8 MHz)'
Build folder: mega328
Additional Defines: VM_DEBUG;VM_DEBUG_ENABLE 1;VM_DEBUG_BANDWIDTH_THROTTLE_MS 100;VM_DEBUGGER_TYPE_HARDWARESERIAL 0;VM_DEBUGGER_TYPE_SOFTWARESERIAL 1;VM_DEBUGGER_TYPE_FASTSERIAL 2;VM_DEBUGGER_TYPE_USB 3;VM_DEBUGGER_TYPE_TEENSY 4;VM_DEBUGGER_TYPE_UART 5;VM_DEBUGGER_TYPE_USART 6;VM_DEBUGGER_TYPE_USBSERIAL 7;VM_DEBUGGER_TYPE_TTYUART 8;VM_DEBUGGER_TYPE_NET_CONSOLE 9;VM_DEBUGGER_TYPE_Uart 10;VM_DEBUGGER_TYPE_COSA 11;VM_DEBUGGER_TYPE VM_DEBUGGER_TYPE_HARDWARESERIAL;VM_DEBUG_BREAKPAUSE;
Architecture Tools: C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/
Sketchbook: file:///C:/Users/Massimo/Documents/Arduino
Core Include Paths
Include Path 'C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino'
Include Path 'C:\Program Files (x86)\Arduino\hardware\arduino\avr\variants\eightanaloginputs'
Library Include Paths (2)
Include Path 'C:\Users\Massimo\Documents\Arduino\libraries\AltSoftSerial'
Include Path 'C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\Extensions\t5mynzxg.y1e\Micro Platforms\default\debuggers\VM_DBG'
Platform Libraries Root Include Paths
Include Path 'C:\Program Files (x86)\Arduino\libraries'
Include Path 'C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries'
Include Path 'C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\Extensions\t5mynzxg.y1e\Micro Platforms\default\debuggers'
Include Path 'C:\Users\Massimo\Documents\Arduino\libraries'
All import libraries will be re-compiled
 

"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-objcopy" -O ihex -R .eeprom /LedTest.elf" /LedTest.hex"
Binary sketch size: 7,300 bytes (used 24% of a 30,720 byte maximum) (2.41 secs)
Minimum Memory Usage: 603 bytes (29% of a 2048 byte maximum)
Uploading to I/O board using 'Arduino as ISP'
Uploader started for board Arduino Pro or Pro Mini w/ ATmega328 (3.3V, 8 MHz)
Uploader will use programmer name: arduinoasisp
C:\Program Files (x86)\Arduino\hardware\tools\avr\bin\avrdude "-CC:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf" -v -patmega328p -cstk500v1 -PCOM3 -b19200 zatmega328/LedTest.hex:i"
Error during upload using programmer

avrdude: Version 6.0.1, compiled on Apr 15 2015 at 19:59:58
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2009 Joerg Wunsch

         System wide configuration file is "C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf"

         Using Port                    : COM3
         Using Programmer              : stk500v1
         Overriding Baud Rate          : 19200
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x66
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x18
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x78
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x06
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x18
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x18
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x18
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x18

avrdude done.  Thank you.


The uploader returned an error
 

Here we go, was at the end of the paste:

Error during upload using programmer

avrdude: Version 6.0.1, compiled on Apr 15 2015 at 19:59:58
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2009 Joerg Wunsch

         System wide configuration file is "C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf"

         Using Port                    : COM3
         Using Programmer              : stk500v1
         Overriding Baud Rate          : 19200
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x66
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x18
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x78
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x06
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x18
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x18
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x18
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x18

avrdude done.  Thank you.


The uploader returned an error

What do you click to upload in the Arduino Ide?

As I suspected you are not using Arduino As ISP programmer. You are using standard usb which is how you upload in the Arduino Ide with the upload button. To upload using a programmer in the arduino ide you use "File>Upload using programmer"

Please un-tick visual micro "Always upload using programmer" which you have ticked by mistake.

Thanks

The only thing that might make my statement incorrect is if you are using the Arduino 1.6.6 beta which has a new menu item that works like the Visual Micro system (Always upload using programmer)