Auto log off user in XP after inactivity

[kk5]

I have a windows xp workstation which is in w2k3 domain. i want to set a gpo for this workstation to autologoff if there is inactivity for more thatn 2 minutes. this is what i have done and its still not working
1. i downloaded winexit.scr, copied it to system32 folder on teh workstation.and also i configured the file to autolog off in 10 seconds
2. created a separte ou and moved the workstation to that ou
3. using gpo, i had enabled the screen saver, enabled screen saver timeout to 60 seconds and also provided the path to winexit.scr. and also enforced the gpo. did a gpupdate /force

i logged into the workstation, after 60 seconds, the screen goes blank and a hourglass appears, but it doesnt log me off from the
workstation
what i am missing here, appreciate your help

KK