Q: If I download the 65 bit I tunes it asks if I want to delete I tunes or fix.  If I choose delete so that I can reinstall the 64 bit, is all my data in library lost

Hello schecmi,

The iTunes music and media files are stored in a different location than the iTunes application.  Because they are stored in different locations, you can uninstall the iTunes application without affecting your media files.

The iTunes media files are stored in the following locations:

About the iTunes Library files

Your two iTunes Library files keep track of what media you've added to iTunes, how you've organized it, and other information such as playlists. These two files are in your iTunes folder by default:

• Mac OS X: /Users/username/Music/iTunes/
• Windows XP: C:\Documents and Settings\username\My Documents\My Music\iTunes\
• Windows Vista: C:\Users\username\Music\iTunes\
• Windows 7: C:\Users\username\My Music\iTunes\
• Windows 8: C:\Users\username\My Music\iTunes\

You can find the full article here:

Where are my iTunes files located?

http://support.apple.com/kb/HT1391

Thank you for using Apple Support Communities.

Best,

Sheila M.