How to disable “You are running out of space” message
It’s really annoying when Windows XP shows that bubble message saying: You are running out of disk space on C: (or any other drive). To free space on this drive by deleting old or unnecessary files, click here.
I really hate it so this is one of the first things I do when I do a clean install of Windows XP.
I go to Start -> Run -> type regedit, press OK.
Go to HKEY_CURRENT_USER\ Software\ Microsoft\ Windows\ CurrentVersion\ Policies\ Explorer.
There, create a new DWORD value and call it NoLowDiskSpaceChecks.
Double click the newly created value and enter the value 1 and press ok. Reboot and that message will never appear again.