setup:
base OS W7-64bit
VMware OS XP
issue
for past 5 days the time in XP always goes 1 hour back to host W7 os time.
Every time I correct it, but still it reverts back..
Pls help...

Grr, please take a look on this article, I hope that you will be able to resolve your problem...
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Goggle search landed me to the following pages. Hope they can help you regarding the issue
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not a Vmware user don't enough knowledge about this..
check the autoadjust option (right click on time in systray > adjust date/time > time zone tab > check "automatically adjust ..."
by not having the auto-adjust for DLST enabled in WinXP, it actively resets back an hour
Also check the time-zone
