All previous versions of Adobe Reader should have been uninstalled before installing v6.0.
Adobe usually inform you to uninstall any previous versions.
Sorry, can't help with the Windows problems.
The only thing is, anything ending with .tmp will be a temporary file, but what they belong to couldn't say.
If you are on XP then there is a Disc Clean program which you can use and it keeps the deleted stuff till you are sure everything is ok.
Alternatively, you can delete the items and use System Restore is it goes pear shaped.