Desktop icon not working

If you can run System Restore, do that and Restore to a time before the problem started.


How to do system Restore Win Vista + Win 7

http://www.howtogeek.com/howto/windows-vista/using-windows-vista-system-restore/

take a scan with combofix which can be downloaded from..

http://www.combofix.org

a-squared Free - Free of charge Anti-Virus, Anti-Trojan, Antivirus

http://www.emsisoft.com/en/software/free/

bon courage.