I know this is not an anydvd issue, but I hope this is useful advice for anydvd users.
I have found from experience that system restore does not always wind back as one might expect.
System restore is basically a registry and driver backup tool but does not delete other data.
System restore is generally ok if you install something from new, find it doesn't work and you rewind immediately.
However, I found system restore doesn't always seem to properly handle updating of software. (I had lots of problems with Nero). I am guessing here that some packages install items which system restore thinks is simply data and on restore does not properly revert to older versions.
I strongly recommend that any user does regular backups using a package like Norton Ghost (or similar). These are virtually 100% reliable as they basically create a clone of the disk i.e. on restore the disk is identical to what it was at the time of backup. However, all data created since the backup is lost.
Many back up systems allow incremental backup which will back up only items changed since last full back up - this is much quicker generally and minimise amount of data lots - many companies do this on a daily (say) basis with full backups on a weekly (say) basis. Thus any disaster is limited to 1 day's worth of data.
I don't actually keep much data - really only applications so I tend to backup monthly or when I install a new application. I have had to use the backups from time to time and it has saved me much aggravation.
Of course I always try system restore first and revert to backup second if restore does not work.
With a decent backup system, you can install any update to anydvd with confidence knowing you can back track safely. It's a false economy (in my opinion) not having a decent back up system.