Login problem

I am runninf Win2k pro in my computer. There is 3 user created in the local computer. 2 of it are member of administrator group and the other 1 is in the power user group. Couple days b4 I turn on and try to login as local administrator. It can successfully login, I look at the loading personal setting window, suddenly " Saving setting " window prompt out, and it jumps back to the login screen again. I had tried many times even restart, same result come out. Finally I found out something, whichonly user in administrator group got this problem, but the user in power user group. I have no idea what the problem is, pls help..