Why are a few of my desktop icons randomly disappearing?

Hi. Yesterday I had noticed something extremely fishy about my desktop. I noticed that a few of my shortcuts had disappeared. My Firefox, iTunes, SWTOR and NBA2k12 shortcuts had disappeared and only those four. I immediately became very worried and ran a few scans to see if maybe I had picked up a virus or some type of spyware. I'm running windows 7. If you have any idea why only a few of my desktop icons would be disappearing please let me know. ASAP. Thanks in advance. **EDIT** A friend of mine suggested running a system restore and then downloading a program called malwarebytes to scan my PC. I restored and ran malwarebytes and that picked up adware.gameplaylabs , the malwarebytes program then removed the adware and I assumed everything was okay. I then decided to reboot my PC and when it launched back up I again was missing those four shortcuts.
Answer:

Doing a system restore on an infected computer will only increase the chances of rejuvenating the virus hidden in your restore points. Disable system restore in control panel >System. Then restart the computer in Safe Mode and do a system scan with malwarebytes after updating it. Then also download superantispyware to scan again for remnant viruses before starting in normal mode and reactivating system restore.

Sinistar... at Yahoo! Answers Visit the source

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