How do I make Lightroom 4 run again?

Can I uninstal and reinstall, just putting in my serial number(s)? I have
them ready to type in. It is the same computer.
It will not start. I have Windows 7. Often things will crash, but usually
they will restart. I had to power down when I had a lockup type issue
with an application. LR4 may have been running and been damaged.
But I ran it since that...
If I try a Windows Uninstall and select the fix the installation option
will it run?
Any good information?

And if re-installing doesn't solve your problems, try resetting the LR preferences file as per here:
http://www.lightroomforums.net/showthread.php?14226-Resetting-(or-Trashing-)-the-Lightroom -Preferences-file
Beat

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