Freaky error message

Does anyone know what is causing this error:

Its not the file system because I still have 3G free on my drives (at least)
Answer #1
usually, the minium % free space is determined by you during OS configuration. default is about 15% or so…maybe 5%, i don’t remember. but see if that warning msg is running in the background and your able to get rid of it if your ok w/ only having 3gb of free space. (cntrl+alt+del) >> process tab >> see if you can find it there.
try a disk cleanup to remove any compresed old files, ect.
Answer #2
or it is a virus
Answer #3
^^^ I doubt its a virus since he only has 3GB left. Its just the low disk space warning. To turn this off in XP:
Run the Registry Editor (REGEDIT.EXE).
Open HKEY_CURRENT_USER\ Software\ Microsoft\ Windows\ CurrentVersion\ Policies\ Explorer.
If it’s not there, create a DWORD value and call it NoLowDiskSpaceChecks.
Double-click on NoLowDiskSpaceChecks, and enter the value 1, and press OK.
For Vista just go tohttp://www.vistax64.com/tutorials/67600-low-disk-space-warning-vista.html
You will lose data, possibly everything, on the hard drive if you run out of space on it. I would recommend backing up your data and getting a bigger hard drive soon, or make more room on the drive by uninstalling stuff you do not need anymore.