Anyone know anything about cubase vst

Hi, finally got a question I cant find the answer to,
Just got my system up and running using cubase vst 5.1 (I know it’s old but I like the interface)& delta66. but I’m having a problem with playing back audio files in the arrange window when I play back a loop, say a 16 beat drum loop the last kick in the loop will drop out . I think the problem has got something to do with my graphics card (ati rad.. 9250) but for the life of me I cant fix the problem. I know its not the ram or the drives as ive spent a fortune on both . any ideas or solutions would be a appreciated
:lol:

have you tried changing the buffer size in the audio setup window and do you have the most up to date drivers?

Amusing topic title. Thats like walking into garage and asking if anyone here knows anything about cars.