Hi, and welcome. Lets boot into safe mode, and configure winodws to Show hidden files. To do this do the following.
file 1 Click the Start Button
2 In the Start menu click Control Panel
3 In the Control panel Window click the Folder Options Icon
4 The folder Options Window will now Open
5 Click the View Tab
6 In the view tab window look down the list for a section marked Hidden Files and Folders
7 Enable the option Show Hidden Files and Folders by left clicking the radio button on the left of the option with your mouse. Then uncheck Hide protected operating system files. CLick yes to the dialog.
8 Press the Apply button
9 On the next screen press OK to exit
10 You should now be able to view the hidden files and folders.
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1. If the computer is running, shut down Windows, and then turn off the power
2. Wait 30 seconds, and then turn the computer on.
3. When you see the black-and-white Starting Windows bar at the bottom of the screen, start tapping the F8 key. The Windows 2000 Advanced Options Menu appears.
4. Ensure that the Safe mode option is selected. In most cases, it is the first item in the list and is selected by default.
5. Press Enter. The computer then begins to start in Safe mode.
Then when in safe mode run HJT again and put a check next to the following items.
R3 - Default URLSearchHook is missing
O2 - BHO: Class - {3979E37D-A390-F477-119B-37737430C116} - C:\WINDOWS\system32\appcx.dll (file missing)
Click Fix Checked
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While still in safe mode brose to and delte the following file (If exisits)
C:\WINDOWS\system32\appcx.dll
Empty Recycle Bin
Reboot Normally
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Then please download ewido - www.ewido.net - Install. Update. Scan. Remove anything it finds.
Post a new HJT log, and the ewdio log.