There are thousands of reasons... Most common reasons are virus, one of newly installed software causes explorer to stop working and damage of explorer.exe.
There are many new additions to Windows 7, including:-Jumplists-Built-in ISO burner -Customization of Notification Area -XP Mode (Not just compatibility view)-Improved touch/touchscreen...
I would say Windows 7. Normally i would say it's what suits you but in this case, know for a fact that Windows 7 is much less frustrating than Vista. It doesn't crash (as much), its much faster,...
To correct the problem you need to delete everything in the prefetch folder.
Perform Start - Run - Prefetch (type in prefetch) - Press <Enter>
Now delete everything in the Prefetch...
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