hatps

I have a toshiba laptop runing windows XP with 512 mgs of ram, 1.3 gig processor. my cd/rom has disappeard and I have downloaded the drivers from toshiba. it says I have the drivers already installed. I had this problem before twice. once I formatted the hard drive, and fixed the problem. which really is a last resort since I don't want to loose anything. I have no way of backing anything up. the other thing I tried was system restore the second time this happened. which worked but since then I had several viruses and turned restore off to pevent replication of the virus.

Can anyone help