Big time problem with Vista OS, crash!!?

Hello everyone. Using mother's computer. Big time problem! I was updating my catalyst driver for my ati radeon card. And while it was installing it it showed that a certain folder was not there and this that and the other for whatever reason during installation then all the sudden my desktop was blank. There were no files. I restarted my computer and its asking for the boot disk and I do not have one i have to contact the manufacture. It is a new computer, i have so many antivirus engines i know it shouldnt be a virus of any sort. I am not sure what happed. Could something be interferrring with the graphic card jupdate and the framework update with windows? Any help or suggestions would be really helpful. I have/had eons of important work on that computer that I cant let go to waste! Lots of typos i know but I am in haste w/ this.