Now I am 99% sure it is a virus, the type which is self protective for it recognized Hyjackthis as a potential danger. It is running malicious processes.
This will require some powerful poison and I happened to have some in my secret cabinet.
Let us try the following steps:
1. Remove the Hyjackthis copy on your computer, it may have been corrupted.
2. Try renaming Hyjackthis to Explorer.exe and then install in your C:\ folder and attempt running it.
If the above is not successful:
3. Download Combofix:
4. Again, save it to your C:\
5. Disable your antivirus and all other applications
If after running Combofix your system is not stabilized, I will eat my socks.
Let me know how it went.