the chances of anything going wrong after a system restore are very,very small so don't worry about having a go. if it don't work just do it again and choose undo last restore. a defrag puts all the fragmented files together on your hard disc so your pc can find them quicker. a bit like a warehouse with parts of a machine, all on different shelves that you have to go looking for. it puts them all on the same shelf so helping speed up your pc. be aware that if you defrag with windows defrag it will take a long time.
This thread is now locked and can not be replied to.