TortoiseCVS is an extension for Microsoft Windows Explorer that makes using CVS fun and easy. Features include: coloured icons, tight integration with SSH, and context-menu interactivity.
I feel I'm going crazy. 2 days ago was 8 gb of free space in C. Today had 300 MB. After 1 hour search the problem I opted to uninstall TortoiseCVS! Now I have 8 gb of free space again!