Question : the current time on this computer and the current time on the network are different

I get this on an SBS when trying to log in "the current time on this computer and the current time on the network are different"

I have seen a lot of information around on how to fix this, but i cannot log in, so i cant even try to fix it.

Answer : the current time on this computer and the current time on the network are different

Boot into your BIOS and try correcting the time there. If necessary also replace the CMOS battery.