I recieve this message every time I start up Windows XP - access violation at adress 10001340. Read of address 10001340 -

I only get the option to press OK. No other explanation. To make it worse my desktop, laptop and the other office computer all say the same.
All are running windows xp sp 3 except my laptop sp 2.

All computers seem to be slower or is it my amagination?

Please help!