We Have an NT4 PC (130mb Ram) which runs 24/7. During working hours it works fine. but recently it has 'frozen' every night (out of hours) needing a reboot the following day

In case it was a 3D screensaver problem we chose the 'Logon screensaver' which ran okay but when checking the settings found that after it ran, the screensaver option became 'none'
This may be co-incidence but I wonder if the two problems are connected

Any Help will be appreciated as this is a mission critical PC
Thanks