Document icons show as unknown

[Muffin`]

Icons for files opened by Word, Excel, PowerPoint 2007 etc show as unknow, PDF's and Adobe Reader also DWG files if you know them with Autodesk's DWG viewer. Except MS Project 2003 which has just been installed, they show fine. It's Vista Business x86 on a Domain.
How can I rebuild the icons? I've tried killing explorer and deleteing the cache, no joy.

I've tried searching but my efforts just show Mac stuff.

 

[theheyes]

I've had a similar issue with Office 2003. Reinstalling Office solved the problem.