Welcome to TSF.
Before you do anything else, please create a folder for HijackThis and put it in a permanent folder (like C:\HJT) instead of the Temp folder. This is required because HijackThis will create backups and we don't want them to be deleted.
The Temp folders should be cleaned out periodically as installation programs and hijack programs leave a lot of junk there. Download CleanUp!
http://cleanup.stevengould.org/ (Alternate Link if main link don't work -
http://www.greyknight17.com/spy/Cleanup.exe ) and install it. Run CleanUp! and click on CleanUp! button. When it asks you if you want to logoff, click on Yes.
Make sure to close any open browsers. Run a scan in HijackThis. Check each of the following and hit 'Fix checked' (after checking them) if they still exist (make sure not to miss any):
O4 - HKLM\..\RunOnce: [wextract_cleanup0] rundll32.exe C:\WINDOWS\System32\advpack.dll,DelNodeRunDLL32 "C:\DOCUME~1\IaM\LOCALS~1\Temp\IXP000.TMP\"
O4 - HKLM\..\RunOnce: [wextract_cleanup1] rundll32.exe C:\WINDOWS\System32\advpack.dll,DelNodeRunDLL32 "C:\DOCUME~1\IaM\LOCALS~1\Temp\IXP001.TMP\"
Restart and run a new HijackThis scan. Save the log file and post it here.