Long story short - My PC gained a rootkit, which in turn, damaged some system files. One of these was something to do with drivers. I ran AVG's recovery CD, and it did its job removing the threat.
Since then, my computer has been fine on the infection-front.
However, I had to reinstall drivers for quite a few things. My LAN port no longer works (and doesn't seem to like the new drivers I downloaded), but I've worked around that with a USB - Ethernet connetor, which works fine.
My graphics card, a ATI 5570 however, isn't going quite so well.
I already had a copy of the installer for this as I had to downgrade the drivers recently anyway, due to a compatability issue with an older game, so I know this installer works perfectly.
However, since the removal of this threat, the installer for the Catalyst Control Centre and display drivers isn't fuctioning as desired. It only installs CCC, and NOT the display drivers:
When the installer completes, it says 'Installation Complete (warnings occured during installation), although nothing is given in the log file in terms of errors.
Knowing I still had the original install CD, I popped it in and navigated to the drivers section, where it would normally allow you to install just the display drivers.
This starts up, but then gives this error:
Followed by this:
I then thought this might be due to Windows Installer/Installshield, so I tried to redownload that from the Microsoft Website. Ok, so I open that:
Yes, the Windows Installer service is running. I've tried restarting that service, restarting my computer, and tried in safe mode (but it can't start that service in safe mode anyway)
Any help much appreicated!