Enable Picture and Fax Viewer
Go to Start/Run and type: regsvr32 shimgvw.dll or regsvr32 /i shimgvw.dll
To get a new copy: EXPAND X:\i386\shimgvw.dl_C:\Windows\system32\shimgvw.dll
If you disabled the fax/picture viewer by using regsvr32 /u shimgvw.dll, then changing user icons fail to work: You need to re-load the dll and it will work. Have only tried this w/ XP Pro. Reload by typing in regsvr32 shimgvw.dll.