i still have 3.317 on my back-up laptop (xp) i already upgraded my show laptop to 4.05 ( no problems so far


), now when 4.06 cames up i will upgrade my back-up, ( i don't upgrade both laptops at the same time )if just incase i have problems with 4.06 will i be able to re-install 3.317 ( i have the setup saved to a cd ),