Association icons not showing

Hi, I have a workstation running X64 and for some or other reason the icons are not showing the programs that it is associated with, like Adobe Reader for pdf, Dreamweaver for asp, AutoCad for dwg etc.

It is just showing generic icons although, when you click to open the file it uses the correct program to open it with.

Any ideas why?

I've got the same problem myself, it started today.
Some are showing as normal though and the rest of the real icons are covered over by a generic icon.
It's possible to see the edges of the real icons.