Constant crashing

I upgraded to Windows 7 64 bit and it keeps crashing into blue screen of death with PFN list corrupt usually. I have 4gb of ram, 2gb of DDR2 666mhz and 2gb of DDR2 800mgz, that shouldn't cause it, right?
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  1. Best answer
    Which is the error number that show the blue screen? Usually this problem is 'cause drivers or program installed recently are causing conflicts
  2. I don't know because it restarts before I can write any information down. Could the ram be defective even if I run a memory test and it passes?
  3. How frecuently is the blue screen? 5 minutes? 10 minutes?...
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