Must I uninstall 6.06 before installing a newer version.? Doesn't the new version uninstall the older version? I already have CCleaner and use it regularly.
As far as I know, as killerb255 said, "newer versions of Adobe Reader will uninstall older versions." But, you've tried that and it hasn't worked. Therefore, another approach is needed.
The fact that you regularly use CCleaner does not address the procedure I recommended, that is, the sequence I mentioned.
... uninstall Adobe Reader 6.06, download and install CCleaner and then run its Windows scan and its Registry scan, and then download and install Reader ...
To reiterate:
1) disable your anti-virus program
2) uninstall Adobe Reader 6
3) run CCleaner (be sure to include the Registry scan; repeat it since additional items sometimes appear upon repeat scans.
4) install a newer version of Adobe Reader
Forget about Adobe Reader 7.0.
Actually, if you want to install version 7, I think that's OK. As I recall, I liked that version fine, but I also like version 8. I don't recall why I updated to 8, perhaps just because Adobe was prompting me to upgrade.
If you still are not able to get Adobe Reader to install, I will suggest another registry cleaner. Here, in the forum, we're cautious about advising people to use registry cleaners, since the more aggressive ones can cause problems. But, if you Reader still won't install after the above procedure, I think the problem is that your registry still contains remnants of the previously install Reader. Thus, a more aggressive registry cleaner may be helpful.
If you try this above procedure and get an error message upon attempting to install the newer version, please post a detailed description of what happened.