pin to taskbar

Dragging a shortcut to the taskbar I get a red no-entry sign and cannot pin.
Have tried most suggestion I've found but non work!
I have IE - MsWord and MsExcel pinned to the bar OK.

Any suggestion will be appreciated.

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: Intel(R) Core(TM) i3-2120 CPU @ 3.30GHz, Intel64 Family 6 Model 42 Stepping 7
Processor Count: 4
RAM: 8174 Mb
Graphics Card: ATI Radeon HD 5450, 1024 Mb
Hard Drives: C: Total - 71532 MB, Free - 10015 MB; E: Total - 403421 MB, Free - 375581 MB; F: Total - 43115 MB, Free - 33384 MB; I: Total - 30396 MB, Free - 26288 MB;
Motherboard: ASUSTeK Computer INC., V-P8H61E.
Antivirus: Advanced SystemCare Ultimate, Updated and Enabled