I may have found the problem or at least one source of problems in my case. I have part of my RAM which runs at 133MHz and part of it which should run at 266MHz. The 133MHz RAM is what I got with the laptop and the 266MHz RAM is what I bought after. I should have paid attention, I know <img src="/ubbthreads/images/graemlins/cry.gif" alt="" /> .....
Maybe some RAM problems could explain the locukps for other players?
I'll buy much more RAM but this time all of it running at the same frequency.