What graphics adaptor did you use before? Did these lagging symptoms begin after the new graphics install? If you upgrade, look at the XFX 8600 GT XXX. (32 stream processors, 620 mhz core clock, 1600 mhz memory,1190mhz shader clock and it's GDDR3 with directX 9 and 10), for $149. There's even a $20 rebate offer with it. That was @ Tiger D.