I recently built my new computer and installed win 7 on it. Everything was working fine until now, today in less than an hour my firefox crashed about 20 times and I can't even run installations on programs without getting an error message that the program can't be executed for some reason, same for downloaded stuff. I was downloading winrar and I couldn't run the install because of an error:S. I also got BSOD I guess, blue screen with a huge error message on it only think I could remember of it was XXXX.sys missing or something. Please can anyone help me? Should I reinstall windows 7?