Apperantly after upgrading Q1’s memory, (from 512 MB to 1 GB) AVS Now becomes unstable. Tomi B has a simple fix for it;
Plug in an external keyboard.
Shutdown and reboot into AVS now.
As soon as the boot logo goes away (or is about to go away), hit F8 (repeatedly if need be).
You’ll get an option to “Delete restoration data and go to the boot menu”. Choose this.
XP will boot, but for me nothing showed up (and this is the point I was searching for the restore CD).
Wait until disk activity stops and slide the power switch. If it shuts down, great. If not, just hold it until the machine shuts down.
Reboot into AVS now again.
The system will boot up and immediately go into hibernation.
Reboot into AVS. This time it should work.
You may need to repeat steps 6 and 7 twice. I booted into normal XP accidentally after the first shutdown.
(via Origamiportal)