Can't run HiJack

[whiteboy]

I installed HiJackThis, its window open and I clicked on scan. It ran a few seconds and shutdown, I tried to open it again and I got this message:
"Windows cannot access the specified device, path, or file. You may not have the approprite permission to access the item."
I also have Malwarebytes installed and get the same message when I try to open it. I have AVG installed, it opens but will not scan anything. I have reinstalled all of these with the same results.
I had McAfee Security Center from Comcast installed and I got an aleart that said:
"McAfee has automatically blocked a buffer overflow"
About this buffer overflow: file C:\windows\system32\services.exe
This alert would come up at windows startup, then this message would appear:
"The system process C:\windows\system32\services.exe terminated unexpectedly with status code 1073741819. The system will restart."
Tried to scan and got the same message as with HiJackThis. I could not even reinstall it. Since McAfee isn't installed I don't see these alerts anymore.
I use Firefox as my browser, when I open firefox, Malwarebytes(which runs in system tray) reports IP protection infection detected:(various IP addresses)
also various IE windows popup with adsin them.
Is there anything else that can go wrong, What do I do? Can you help me these problems?

[NonSuch]

We understand that you are having difficulty running certain programs, including HijackThis. However, in order for us to help you it is necessary that you provide us with a HijackThis log, and it is possible you may be able to trick the malware into letting you do this. First, download HijackThis to a clean computer, then rename it from HijackThis.exe to any other name you want, using an .exe extension, for example... YourLastName.exe. Once you have done that, burn it to a CD (preferable to using a flash drive that may easily become infected) then transfer the renamed file to the infected computer and run a scan, then start a new topic and include your HijackThis log.

Please follow the guideline at the link below to start a new topic and post your HijackThis log. If you are unable to create and post a HijackThis log, then your only option may be to reformat your computer and reinstall the operating system.

This topic is now closed. Please start a new topic by following the HijackThis Guideline posted here, just be certain to rename HijackThis: >Guideline for posting your HijackThis log<