When I try to access iTunes, I get a message that the copy of iTunes is corrupted or not installed properly and to please reinstall iTunes.  How can I do this without losing my music library?  thank you, Marty

when I attempt to access iTunes, I receive a message reading, "this copy of iTunes is corrupted or installed improperly, please reinstall iTunes,"  How do I do this and not lose my existing music library?

Hello, marty51.
I would start by removing iTunes and all of it's components in the order specified of this article.  Your iTunes Media folder will not be affected. 
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
http://support.apple.com/kb/HT1923
Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP
http://support.apple.com/kb/HT1925
Once uninstalled, download and install a new copy of iTunes.
If you experience any issue or error when attempting to uninstall any component, these articles will help you resolve those conflicts.
"The feature you are trying to use is on a network resource that is unavailable" alert when removing Apple software in Windows
http://support.apple.com/kb/TS3704
iTunes for Windows: "Error 7" message when opening iTunes
http://support.apple.com/kb/ts3074
Cheers,
Jason H. 

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