Please provide the following:

~ HijackThis log file (see #3 on this sticky).
(please attach the entire file as a .txt document, do not copy/paste it)
~ When did the error start occuring (after installing X or uninstalling Y or running Z, etc.)
~ Are there any other errors or issues you noticed on this system?
~ When the error comes up, what options you have to click on, what happens after you click on any of the available options?
(screenshots would be best).

Someone will get back to you once you provide the information.

~TL