I can assure you that this is a VERY uncommon (if not: unique) happening. So maybe it's some malware (ransomware?) indeed.
What exactly is it asking for now? Please provide all details (a picture of the screen on your favorite photo sharing site would be very nice also) . I've never seen a PC asking for the installation disk.
So it's all very weird. I'd start searching for the Windows and drivers installation disk and another CD drive, because it seems likely you need both of them. But, maybe, this is a good occasion to buy a wonderfully fast and nice new computer.
I had Windows XP professional. After running disk cleanup - It wiped out everything. I don't even have windows! I can't boot up - it is asking for the installation disk except I put it in a "safe place" and don't know where it is. My cd drive doesn't work anyway - computer is old. I had a popup that my space was low and it suggested to run the disk cleanup. I clicked ok. After the initial scan - I started it (after looking at the details of each option it suggested). Went to work and when I came home - my desktop was empty except for "my computer" and "recycle bin". Clicked on my computer - there were folders and such but they were all empty. Of course then it got shut-down and now it won't boot up. Could some new virus have done this? What should I do?