There are a couple of possiblities. There are a number of variants of malware that can do this or it could simply be that your version is corrupted for whatever reason. I would download a new copy of it for starters and see what happens. Please post back with whatever happens and we will go from there. This is not my regular forum, I'm usually in V&S but I check this one a few times a day too. You can get it at any of the links.
HijackThis download locations:
Current version of HijackThis is 1.99
Ive been trying to run it. It seems to freeze up before its finished scanning. I tried the older version, also.
At the top of HJT. on the blue strip, it always says "015 - Trusted Zone Enumeration". Looks like thats where it stops. I do not have CoolWWWsearchsmartkiller.