Download http://www.ccleaner.com/

Start CCleaner.
Click on the "Options" icon at the left side of the window, then click on "Advanced."
Deselect "Only delete files in Windows Temp folders older than 48 hours".
Click on the "Cleaner" icon on the left side of the window, then click Run Cleaner to run the program.
After CCleaner has completed, click Exit.

Find your hijackthis.exe here
C:\Documents and Settings\HP_Administrator\My Documents\hijackthis\HijackThis.exe

and rename it to scan.exe

Then post a new Hijackthis log