windows - Why is wpffontcache_v0400.exe hogging the CPU?

In the last few days I've noticed really poor performance on a virtual machine I'm using at work. It's running Windows Server 2003 SP 2. When I check Task Manager, the process wpffontcache_v0400.exe is consuming almost all of the CPU.

What is wpffontcache_v0400.exe and how can I get it to not consume all of the CPU?

When I kill the process it starts up again straight away. Sometimes it resumes to normal CPU usage, other times it just jumps back to 100% usage no how many times I kill it.

Answer

Clearing the font cache as described here by Jordan and here by Cody seems to do the trick.