We understand that you are having difficulty running HijackThis. If your operating system is Windows Vista, it is possible that you only need right click on HijackThis and select "run as administrator" to enable the program to run.
On the other hand, especially if this is not a Vista machine, or if you have tried running HijackThis as an administrator and that did not work, malware may be stopping HijackThis from running. If that's the case, then it is possible you may be able to trick the malware into letting you run HijackThis. 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<