I upgraded to AVG free 8.5 (from previous version) 2 days ago. A few hours later the computer started hanging, then made ominous squeaks and I got serious error messages. I managed to back up my data then on rebooting I repeatedly got "Operating system not found". Some kind person on YA suggested I unplug and leave the comp overnight, then try rebooting. It did boot this morning, so I removed AVG (and the Ethernet plug) but at next start up I noticed that the message "Serial Presence detect (SPD) device data missing or inconclusive....100MHz memory assumed". (I don't think that was there before but I'm not certain.) The HD is 7 years old and it runs WIn2K which I need to run some professional software that would cost thousands to upgrade for XP/Vista.
It's running OK at the moment but would you think the comp is on its last legs - or could this be all down to AVG? Any thoughts would be welcome.