NOD32 slowing my PC?

After reading various reviews and users recommendations, I purchased NOD32
for my PC. The installation went fine and it seems to work really well.
However for some reason since installing it,. my PC seems to work really
slowly, especially when opening up new files, of browsing through my PC's
folders etc.

Being a bit of a PC newbie I can't figure out what the problem is, but it
definitely seems to have started just after I installed NOD32.

My PC specs are as follows:

Intel P4 2.6
1 gig RAM
SB Audigy 2 Soundcard
GForce 4 Ti4800 gfx card
Windows XP (SP2)


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