>>I just got the first crash of the Windows in 18 months. The move to Windows 7 was done on Monday. Then, suddenly, I have this Memory Management blue screen appearing confirmation a shut down. I wonder if this could be related that the 8 GB memory management is not that fined up yet on that OS.
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>I have 8GB memory and haven't had a single crash yet.

I have 16 on my Win7 Ultimate 64bit desktop here - works great. 8 on my Win7 Enterprise 64bit laptop - ditto.