are u sure u dont have UAC acting up ?
do you have UAC enabled ?
or some other program that protects system folders with "auto denie acces" set ?
did you install it under the same account as you use it ?
Tried both on and off.
I've only got AVG that would do that sort of thing, and i odubt it does anyway.
Only have one account on this :]
Humm. I've got revision to do so i'll try older versions later. Thanks for your help anyway - i may resort to attempting a dual boot again.