Game wont run , techie help please

[Raven Vale]

Hiya , at this point I had uninstalled and reinstalled Diablo and ran the vid test with no problems . I thought that was it till I tried running again , but no go . I have no idea what caused this , atm I am busy backing up stuff to cd then I am going to reformat , if that does'nt work , I think I may just give the accounts up , WoW is around the corner and that will keep me busy for quite some time .