new 6800: flurry of system crashes

[frasier]

ok, I got a 6800 and installed it. But when I went to play CSS I got the blue screen of death and various errors. These are generally what the errors said

error 1:
IRQ_NOT_EQUAL_LESS_THAN
***SYSTEM HALTED***

error 2:
NMI: Parity Check / Memory Parity Error

If you can help please do, I don't want to have to keep using my X600 PRO

EDIT: forgot to mention: now Mcafee is giving me "Possibly unwanted program" popups fairly often.