What No Space???

It's a normal day at work today, but I thought perhaps I should do a check on my servers' health. (Where should the apostrophe go there? Many servers) My AV server says no disk space... I mean actually 0kb left on the system drive. Ouch! It appears that the Sophos program is creating Gb of logs, all the time. One second 300Mb, one second 1.5Gb. Most annoying. I have a simple solution though. Lets uninstall the the Sophos stuff from C and put it on D.

All going well until I get the following error: Cannot uninstall from drive C.
Disk space required -1200kb, actual space on disk 0Kb.

Yes that's right, negative disk space required, but there's not enough available... Argh!

I love computers though.