The other day I was again using CombFix to clean what turned out to be a keylogger on a client’s PC.
I found, though, that when I tried to run ComboFix.exe, the file downloaded, nothing happened.
So I renamed the file (and I suggest you do this as you save the file when downloading it just to avoid a potential problem) temp.exe instead of ComboFix.exe and I was able to run it and clean the computer.
Note also that I had booted into Windows XP “Safe Mode with Network” by pressing the F8 key just after the system powered up, thus activating the Windows XP boot menu.
Ordinarily when I go to clean a PC infected with malware I will head over to malwarebytes.org and grab the free version of their software.
Many malware infections will prevent you from going to their site so you may have to download on a different PC or do so in safe mode with networking. If using a different PC, then transfer the malwarebytes setup file via USB stick.
Then you need to boot Windows in “safe mode with networking” so that you can install malware bytes and download updates.
The other day, though, I had a real badly infected PC where malwarebytes cleaned and fixed over 1000 problems but the machine was still infected. It was easy to determine it was still infected because it would not allow me to go to Windows update.