Graphic driver or RAM issue?

Last week I "upgraded" my RAM from 1GB DDR1 400MHz to 2GB DDR1 333MHz. System is faster but I can see no change in MxO performance...  anyway, I've left alone that PC for a week and when I turn on the machine now, MxO looks like this:





All these things you see are moving all the time, so I get dizzy when I try to look there for more than 10sec.

My hardware:

ASRock K7VT4APro motherboard
AMD Sempron 2600+ CPU
ATI 9600 SE GPU
2GB RAM TakeMS, DDR1 333MHz


I haven't tried to use the 1GB 400MHz RAM again, 'cause I gave it to a friend...

My question: has anyone seen something like this before? You think it's the RAM or the graphic driver? I'm using an older version of ATI catalyst...

Thx.

Cheers,
Anuk