Hi judi

Flashplayer has a poor reputation as far as malware is concerned - a search "flash player malware" gives many examples and ways to deal with them.

I am surprised that putting CCleaner onto your used computer gave you issues - the free version of it does not do anything unless you run it.

CCleaner can fix registry issues: CCleaner--->Registry--->Registry Cleaner--->Scan for Issues.

It will report back on issues which need fixing which you can tell it to do.

But, important, it gives you an option of saving those registry changes in your Documents folder - do that - if needed you can restore the registry from that file.