3 weeks ago my time somehow set itself backward by exactly one day. This really messed up all the the computers on the domain. I reset all computers on the the domain using net time. WHen I came to work on Monday all of them were off by 1 day again. This has happened again this past weekend. I have scanned every server and all computers on the network have anti virus protect that is kept up to date. The dc,s are windows 2003 standard sp2 all others servers except one are 2003, 2008 one 1 is 2000. Not sure if it has any bering but this seemed to have started after a MS update. Checking the logs it appears we are starting to receive errors stating the time servers are off line.