Yes. Windows can be repaired instead of replaced, but it depends on the specific damage that has been done. If a window is cracked, but the glass is still in one piece, it can usually be repaired. If the window has been broken and the glass is gone, it will need to be replaced. If the frames are damaged, they may also need to be replaced. If the seals around the window are damaged or missing, they will need to be replaced as well.

It depends on what is wrong with Windows. If the problem is that your computer can't find Windows, you can repair Windows by using a startup disk to start your computer. If the problem is that Windows starts but then stops working, you might be able to fix it by repairing your registry. If your computer has a virus, you'll need to replace Windows with a new copy of the software.