I saw the topic http://forum.avast.com/index.php?topic=81122.0 and I have the same problem.
I have launch OTS software.
I uploaded it here :
http://www.mediafire.com/?zxc704h7ii1aaxz
Thanks
Essexboy is notified…
he is usually in here at 08:00pm - 11:59pm UK time
Start OTS. Copy/Paste the information in the quotebox below into the panel where it says “Paste fix here” and then click the Run Fix button.
[Unregister Dlls]
[Registry - Safe List]
< BHO's [HKEY_LOCAL_MACHINE] > -> HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\
YN -> {602ADB0E-4AFF-4217-8AA1-95DAC4DFA408} [HKLM] -> Reg Error: Key error. [Reg Error: Key error.]
< Internet Explorer ToolBars [HKEY_LOCAL_MACHINE] > -> HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ToolBar
YN -> "{7FEBEFE3-6B19-4349-98D2-FFB09D4B49CA}" [HKLM] -> Reg Error: Key error. [Reg Error: Key error.]
[Files - No Company Name]
NY -> ~33480440r -> C:\ProgramData\~33480440r
NY -> ~33480440 -> C:\ProgramData\~33480440
NY -> 33480440 -> C:\ProgramData\33480440
[Empty Temp Folders]
[EmptyFlash]
[CreateRestorePoint]
The fix should only take a very short time. When the fix is completed a message box will popup telling you that it is finished. Click the Ok button and Notepad will open with a log of actions taken during the fix. Post that information back here
I will review the information when it comes back in.
Depending on what the fix contains, this process may take some time and your desktop icons might disappear or other uncommon behavior may occur.
This is no sign of malfunction, do not panic!
THEN
Download aswMBR.exe ( 1.8mb ) to your desktop.
Double click the aswMBR.exe to run it
Click the “Scan” button to start scan
http://i1224.photobucket.com/albums/ee362/Essexboy3/aswMBR2-1.gif
On completion of the scan click save log, save it to your desktop and post in your next reply
I have follow your instructions but the problem is still present 
1/ OTS : 07092011 154639.log
http://www.mediafire.com/?0uq85a9584qva5p
2/ aswMBR.txt
http://www.mediafire.com/?uhfyb88ipk9axr5
3/ I have start a new rapport of OTS scan : OTS.Txt
http://www.mediafire.com/?0ducqc4ntuo89k3
Please help 
Thanks !!!
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.
http://i466.photobucket.com/albums/rr21/JSntgRvr/TDSSKillermain.png
[*]If an infected file is detected, the default action will be Cure, click on Continue.
http://i466.photobucket.com/albums/rr21/JSntgRvr/TDSSKillerMal-1.png
[*]If a suspicious file is detected, the default action will be Skip, click on Continue.
http://i466.photobucket.com/albums/rr21/JSntgRvr/TDSSKillerSuspicious.png
[*]It may ask you to reboot the computer to complete the process. Click on Reboot Now.
http://i466.photobucket.com/albums/rr21/JSntgRvr/TDSSKillerCompleted.png
[*]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.
When I run TDSSKiller software nothing happens.
Same in safe mode. (OS Vista SP2)
The process TDSSKiller.exe opens in the task manager and closes immediately. (1-2 seconds)
I am now on vacation and back in one week.
Thanks for your help.
OK next hammer
Download ComboFix from one of these locations:
* IMPORTANT !!! Save ComboFix.exe to your Desktop
[]Disable your AntiVirus and AntiSpyware applications, usually via a right click on the System Tray icon. They may otherwise interfere with our tools
[]Double click on ComboFix.exe & follow the prompts.
When finished, it shall produce a log for you. Please include the C:\ComboFix.txt in your next reply.