Can't Change Desktop Background After The "Windows Repair Virus"?

So I had the "Windows Repair" virus. I succesfully removed it with MalwareBites and Ad Aware and everything seems to be working fine, with exception to my desktop background. It's pitch black.When I try to change it through personalize ->desktop backgrounds nothing happens, I can only change my background to some collor, for example from all black to all white etc.When I open My Themes folder, it's totally empty.When I try opening a picture and pushing "set as background image" it says : "the image can't be set as background. Internal error occured".Also, I don't know if it's relevant, but the virus hid some files, like my documents and internet explorer shortcut and so on. I used unhider.exe to unhide them. Also scanned my computer a couple of more times and there's no trace of adware or viruses anymore.However, I also noticed Windows Repair file can't be located, and I don't have the windows disk ( It's a Toshiba Satellite, which doesn't come with a windows cd). So frustrating..