A short while ago, I had my hard drive die on me and at the same time my 1Tb backup drive! I took it back to the guy I bought the PC from and although the backup drive could not be recovered, he managed to get my machine working again by making a minor change in the BIOS which then got it out of that continuous loop it found itself in after multiple BSOD episodes.

Everything seems to be working fine but yesterday when I tried to save something from Google Chrome, I got and insufficient permission problem and when I try to install software, I get an error of 2503.

I have already followed the suggestions here but none of this worked for me.

Any suggestions would be appreciated.

EDIT: This started happening after I tried running a number of tests to get the machine working, including a previous restore point.