First of all combofix is not a "regularly used" tool. It should only be used when directed to do so and never should be re-used on another problem. The instruction to use combofix in a thread is ONLY FOR THAT PARTICULAR poster and NOT FOR OTHERS. It is supposed to be uninstalled following all steps given by the helper working with the poster. This can damage your system if used incorrectly or for the wrong reasons OR if used too early too.
If you have used it for this problem post the log.