actually sounds like you have a virus. unless your system gives you a way to make your own backup disks (most do now) or if there is a restore partition you can use that. just make sure you back up your important data first.
Update on HP mini is that ccleaner identified 8 missing dll files in the registry scan.
I don't know how or when these files were deleted. It seems if they are identifiable
they could be downloaded and put back in the system.