[dantes9]

You should be able to get rid of the Pro Tools entry from the Add/Remove Programs list by manually editing the registry like Rail suggested. Once this has been done you should be able to start a fresh install.

The specific key you need to get rid of can be found here:

HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Uninstall

you need to find the key for Pro Tools. The 6.9 key is {8854A2DB-FE59-4352-85A2-2B0411B2CF6C} but it will be different for older versions. You can look at the "Display Name" value on the right hand side of regedit to find the proper key (it will say "Digidesign Pro Tools LE" for a Display name value). Once you have located the key, delete it. Reboot the computer and Pro Tools should no longer be in the add/remove programs list and you should be able to reinstall.