Got Virus Attack / Performed System Restore And Removed Data?

i got a series of really bad viral infection on my computer. My virus programs took care of the viruses but also deleted some of the start up software that is used to boot up my computer correctly. as a last ditch effort I used the system restore function on my computer to reboot it back to a previous configeration. The computer booted back to its original out of the box configuration and I lost all my computer files (but on the flip side my computer was working perfectly now that this was done)

I take the computer to the repair shop so that they can do a deep memory scan to recover my files. They find some of the files and put them in a file folder located on my desktop. i am told by the techie working on my computer that there is a series of .dll errors at the start of windows and that they are the result of a viral infection (Obviously the system restore i did did not do its job of ridding me of the viruses. I did not notice the .dll errors when i initially did the system restore, but that doesn't mean that they weren't there)