This error is caused by code in the shellstyle.dll of a visual style. If you are using a visual style made before SP1 then you will receive this error when trying to access Add/Remove programs. Simply change your visual style to the default Luna and you will be able to access it once again.
Note: this is NOT a StyleXP flaw, so using the latest version (1.01L) will not correct this problem; it is a problem with the shellstyle.dll file of the theme/visual style (C:\WINDOWS\Resources\Themes\themename\shell\... ).
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS