Today a got a warning from the OS
"You are running out of disc space!"
What? 160GB is not enough anymore?
After removing some stuff, like temporary files, cleaning the disc, and removing unecessary apps and installations, I decided to look for large files above 150MB and turns out there were about 60GB in SharePoint log files.
(C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\LOGS)
I did find some issues. SharePoint was trying to use Single Sign-On, while SSO wasn't enable on the farm.
Well, since I don't really need logs I just stopped and disabled the WSS Tracing Service. At least now I don't have to worry about keeping an eye on that folder every once and a while.