Maybe you know about this tool, maybe you don't. Combofix is a specialised cleaning tool used by malware fighters to help clean up infected computers. It has been a very effective and useful tool.
However it has come to the developers attention that if Combofix is used on a computer where a specific rootkit is present then it will cause Combofix to recursively delete all files from the system drive.
As there is no way of knowing that the rootkit is present until Combofix is run, it has been pulled until further notice, all official download mirrors have been taken down, if you have the tool saved on your system then please delete it.