Windows 7 Icons Wont Open

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Windows 7 Icons Wont Open. Have created icons by making aliases and placed them on the desktop. Even when i go to the start menu and try from there it still won't open any program.

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Yesterday, i did a scan with avast antivirus and it found 3 'threatening' files. (still need answer!) i have a desktop computer that won't open some (not all) of the icons. Oh no, all the icons on the desktop have become blank!

I then shut it down and did a boot scan with avast.

A common problem faced by windows and ios users is itunes not opening on their windows computer. So basically start menu won't launch at all. When double clicking any of the shortcuts they would just launch windows media center. But i can't open things like steam, or various games that i've downloaded from steam.