aight, im gonna put all steps I saw around that worked for most guys
-first of all all the usual stuff, latest drivers for video, motherboard (specially if u have VIA chipset) blablabla
-dropping down sound hardware acceleration, run dxdiag.exe for this (find it on yer directx folder)
-the one that worked for me, unplug ny USB device, i took my USB optica out and it works great now, back to my ps/2 when playing live
-last of all, try winXP if u can.
plz add sumthing that helped ya if diff than these.