this is your problem
Run hijack this put a check next to these close all browsers and hit fix
Make sure not to miss one
O2 - BHO: (no name) - {000020DD-C72E-4113-AF77-DD56626C6C42} - C:\WINDOWS\twaintec.dll
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To enable the viewing of Hidden files follow these steps:
1. Close all programs so that you are at your desktop.
2. Double-click on the My Computer icon.
3. Select the Tools menu and click Folder Options.
4. After the new window appears select the View tab.
5. Under the Hidden files and folders section select the radio button labeled Show hidden files and folders.
6. Remove the checkmark from the checkbox labeled Hide file extensions for known file types.
7. Remove the checkmark from the checkbox labeled Hide protected operating system files.
8. Press the Apply button and then the OK button and shutdown My Computer.
9. Now your computer is configured to show all hidden files.
reboot into safe mode
How to boot into safe mode
delete these file
C:\WINDOWS\twaintec.dl