I most certainly agree with cottonball!!Is there a reason you need to run ComboFix?
http://www.sevenforums.com/system-security/227589-do-not-use-combofix-your-own.html#post1905406
Vaper,
As gied mentioned, ComboFix was out of commission for a couple of days, but now it is back up. Also, as he/she mentioned, you need to be careful where you download the program from, since there are unauthorized links out there. We do use the right ones.
If sometime you need help with removing malware, feel free to post your concerns here, in the System Security forum.