So in Google about this issue has some decisions. Basically you could find them easy, but you must change values into registry. For new system (PCS Station) I don't advise you to make this. Better try with reinstall of WinCC and Microsoft Server. Finally, this problem regards Microsoft OS not WinCC.
10x for help Umencho.
You was right this problem came from some bug in WindowsXP SP3.
I make new installation under WindowsXP SP2 and now everything is OK.
Again Microsoft .
10x again.