Partition available space issue

Hi, I’m having the following problem in a server running windows sbs 2003.

When I enter my PC, windows does not show the available space for partition c:. This is serious because it’s not only a display problem, it won’t inform other software (such us AV) the available space, which cause a failure it the update proceses among others.

Besides, the mmc open but you can’t load any console inside it (device manager, gp, system administration, etc).

I run spybot, avg antiroot kit, hijackthis, but nothing, I was not able to identify the problem.

Thanks you very much for your help.