It is the 64 bit Windows 7 Professional version. Yes, I took it out and put the old memory back and it's fine. Faulty memory doesn't seem likely, since it works fine with the alternate boot on x64. I did the memory test and it tested fine. I'm puzzled.
My Dell Precision 670 will not boot Windows 7 after upgrading the memory to 8GB. Configuration follows: *BIOS A06 *2 x 4GB SIMMS in slots 1 and 2. These are correct WS670/4GB PC3200 EEC registered modules as recommended. *memory fan is installed *3 SCSI drives with Adaptec 7901 RAID...