Your log looks clean.
Please read carefully and follow these steps. Download TDSSKiller and save it to your Desktop.
Extract its contents to your desktop.
Once extracted, open the TDSSKiller folder and doubleclick on
TDSSKiller.exe to run the application, then on
Start Scan. If an infected file is detected, the default action will be Cure, click on Continue.
If a suspicious file is detected, the default action will be Skip, click on Continue.
It may ask you to reboot the computer to complete the process. Click on Reboot Now.
If no reboot is require, click on Report. A log file should appear. Please copy and paste the contents of that file here.
If a reboot is required, the report can also be found in your root directory, (usually C:\ folder) in the form of "TDSSKiller.[Version]_[Date]_[Time]_log.txt". Please copy and paste the contents of that file here.
P.S:If you are having problems following these steps,just have a look at Essex's reply#3 here
http://forum.avast.com/index.php?topic=81390.0