Lightroom 64-bit crashes

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I am unable to get past the welcome screen in Lightroom 64-bit. Photoshop CS4 also will not fire up -- but all other 64-bit programs run fine. I have done a memory diagnosis, and all 8 gigs of RAM appear to be fine. Bridge works.
This started gradually -- occasional fits of "Lightroom needs to close" became over time frequent crashes and now it just won't get past startup --which it will do and then freeze. Any attempt at getting the program to do anything results in a greyed-out screen and the "The program is not responding" message.
Is there something -- a file maybe -- that is common to CS4 and Lightroom that may be corrupt or missing? I have done numerous removal and re-installs, all to no avail.
This was a problem in Vista, and now I am running Windows 7 -- which is running everything else beautifully. The upgrade to 7 did not change a thing. This would lead me to believe I have a hardware problem --- but what? I loaded the latest driver for my video card, again with no effect.
 
I think you have a memory problem. Try running memtest86 to check your memory but this can take a while.
 
If you calibrate your monitor then try re-calibrating it. Maybe the problem is with the monitor profile which many programs will not be using, but LR and CS4 will be. Also look for bad fonts (not sure how to do that on windows though)
 
Removes and reinstalls wouldn't have deleted preferences, presets, colour profiles, that kind of thing... could be worth a look.

Was the Windows 7 install a fresh install or an upgrade?
 
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