Open Task Manager & end process on the following:

taskmgn.exe

Then delete the file C:\WINDOWS\System32\taskmgn.exe

Close all (browser) windows & rescan with hijackthis. When the scan is finished place a check in the box to the left of the following entries & click 'fix checked':

R3 - Default URLSearchHook is missing

O2 - BHO: (no name) - {85CBFDE0-B26B-4EE5-BD3C-4DE111DE763E} - C:\WINDOWS\System32\winnet.dll

Once done please download the following & run it.
Registry Search Tool. Close to the bottom of the page.
http://www.billsway.com/vbspage/

When it starts, you will be prompted to enter a search phrase. Enter taskmgn.exe and go have a cup of coffee.
When you get back, a message box will be there on the desktop. Say yes to open the results. Copy and paste the contents into a reply here. Once you close that file, it will be deleted, so please save it as results.txt. We may need it again.

Another hijackthis log too plz.