AutoCAD Inventor "Reinstalls"

Hi,

I have seen this occur on several occasions and cannot find an answer.
I run a program on a Windows based machine with an Autodesk Product
installed. (I have seen the same thign happen with AutoCAD and
Inventor 2005) This program used to launch and run correctly. Now,
when the product is run either by using the shortcut on the desktop or
double clicking on the item in its folder the 'Uninstall Wizard' of
INventor launches. I have solved this problem in the past by placing
the CD in the drive (The uninstall asks for this) and this runs for a
minute or so then stops. The problem goes away.

I have now tried this and the process seemed to crash.

Is theis a common problem? Is there a resolution to it?

It seems that autocad uninstalls automatically when a program is run
or executed

It is as if another process is always running in the background
waiting for something to occur.

Thanks For any advice.

Daniel.