My Mac keeps freezing in the middle of applications (most notable Safari) requiring me to shut down and restart.  It also freezes during video playback (online and using Quicktime).  Do I need to wipe and reinstall OS?  I'm thinking I have a virus........

Please help!!  It's driving me nuts.  I've reinstalled the OS via the disc about 3 times so far, but haven't yet erased the drive (and am seriously considering doing so).  I barely have any files on my HD because I run everything off of external drives (after losing a TON of stuff after my Mac crashed in the first 3 months of having it).  I bought the computer in 2007 and was running Tiger.  I passed on Leopard but gave in for Snow Leopard because I wanted an iPhone and iPad.  When I installed SL, I had to reformat the HD and made it Journaled......it's been acting ******** ever since. 

First you don't have a virus because none exist for OS X. So you can stop worrying about hat. If you recently got a warning about a Virus and accepted downloaded some software then you fell for a Trojan. Here is an article about that and how to rid yourself of it.
If you did not download anything like that then doing a Erase and Install would be the way to go. Here is a video that will show you exactly what to do.

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