I was recently given a Dell Studio XPS 1340 without any disk.  I install Windows 7 from a Boot-Legg Copy and everything is working just fine, Somehow it restarts or something and now it will not boot up at all,  Safe mode or anything.  Before I changed the OS It was super slow, had to have had some viruses could barely move. booted up in Safe mode it would function but didn't have the necessary capabilities.   ~ My question I guess is how could I get this computer to function fully?  Is there a way that I can get a replacement CD or anything that Could be used to maybe put Vista back or .... I don't know....