comodo 3.12 xp sp3 uninstall cannot boot login

Comodo Internet Security 3.12 being uninstalled from windows xp sp3 machine due to error 113 when trying to upgrade as per forum instructions to clean uninstall and install latest version.

Uninstalled 3.12 and uninstall completed and requested a reboot.
Reboot system and system struggles to reboot eventually gets to login but will not load profile.

Recovered machine by safe mode and reinstall of 3.12 got system up and running again but still sluggish.

Uninstalled 3.12 and uninstall completed and requested a reboot.
Reboot system and system struggles to reboot eventually gets to login but will not allow login.

I am at a bad stage of wondering if I will have to do a complete system install.

Any ideas as to how to recover from this one?