Are you running on a single core computer? Is it just Photoshop CS3 or something like the Web Premium, Design Premium, etc,
Overall softwares such as CS3 requires alot of memory and CPU usage. You might need to upgrade processor and add more memory.
As for it being a virus, a virus would effect everything including other programs. If you just noticed the slugishness after installing Photoshop, I would look at that as the reason.
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