Have you tried using Disk Utility to do a Disk Repair, as shown in this link, while booted up on your install disk for OS 10.6.8 and under? If you are running 10.7 or 10.8 run Disk Repair from Disk Utility on your Recovery System. It shows you how in the link.
You could have some directory corruption. Let us know what errors Disk Repair reports and if DU was able to repair them. This could just be a start in repairs and you may need a better utility to finish the job.
Then Repair Permissions.
No need to report any Permissions errors........we all get them. Good for starts. By the way there are no viruses for Macs. A lot of virus software does slow down Macs. What do you have installed?
DALEMac OS X (10.7.5), MacPro '07 MacBookPro Late '08G4
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