Why does my computer crashes when using 2 different operating systems on 2 different drives

lpmoore

Reputable
Mar 1, 2014
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I have interchangeable hard drive bays on my desktop. I had Windows 7 installed
for the past year on one drive. I recently purchased Windows 8 OS. I installed it on a separate hard drive. Windows 8 worked. But when I put the Windows 7 OS drive back in the computer
the drive displayed a blue screen, "RECOVERY" and would not boot. Any suggestions?