What Operating System are you using? If vista or Windows seven run regedit.exe and go to the file menu and restore the reg file. Whether that works or not please report back to this thread. If it doesn't work we will explore other possible fixes.
Ccleaner is a gentle registry cleaner, if you had tried another registry "fixer" you would have encounter even more "errors" and you computer would quite possibly be more messed up.
for further registry cleaning with ANY product, please follow the advice in my signature
I was told this was the wrong product and yes, I "fixed" everything checked off before I knew what I was doing, I fear now it's all lost forever and I will need to reformat, which is more of a hassle than trying to figure out what happened and fix it.
I also tried a system restore, this made it difficult for my Pc to start again. I was able to restore it but nothing was actually restored, things also change to unknown icons randomly like the circled ones here.
Also, try using the EDIT button so as to reduce the number of posts as what you just did was "spam". I know you are in a real tight fix at the moment and what's going on with your computer is really frustrating so I'm gonna cut you some slack.
Best of luck mate.
Never use ANY Registry Cleaner unless you know what you are doing!
If you can take a backup of all your data, do that and install a fresh copy if all else fails.