Error 25004 Config.Xml not specified

[Cic!cone]

I have recently installed Microsoft Office 2007 Professional its almost 4 as of now. Even I have installed Microsoft Project Professional just a month ago. I am not sure what is changed, but now whenever I start office application, Project tries to install again. The first thing on my screen that pops up is a is a "Configuration Progress" window. It is "Configuring Miscrosoft Office Professional 2007".

After this Windows Installer windows appear. It claims that "The feature you are trying to use is on a network resource that is unavailable. Click OK to try again, or enter an alternate path to a folder containing the installation package 'PrjProrWW.msi' in the box below".

I have directed this query to a file with that name on my Project 2007 Trial installation disc, but with no success.

Finally, a window pops up that says "Microsoft Office Project Professional 2007 encountered an error during setup. Error 25004. Config.Xml not specified; a valid config.xml file must be authored when deploying '(null)'.

I can close this window and get back to work. I just want to stop this nonsense. Can somebody please help?

[Cic!cone]

It just slept out of my mind that Project Professional that I have installed on my system is a trial verion which I have download from a website. I think this might a important point to figure out the problem which I am facing with my system.