Avast does not start!!

[system]

When my syste boots , i get this error
AvastUI.exe - Bad Image

The application or DLL C:\Program Files\Alwil Software\Avast5\aswAux.dll is not a valid Windows Image.Please check this against your installation diskette.

I reinstalled Avast !
But the same error again.
AvstSrv.exe is not running!!
Help

[DavidR]

This error has in the past been associated with malware/rootkit Bagle, which is designed to kill your AV.

• GMER Anti-Rootkit

@essexboy post:20

http://www.geekstogo.com/misc/guide_icons/gmer.png
GMER Rootkit Scanner - Download - Homepage
[] Download GMER
[] Extract the contents of the zipped file to desktop.
[*] Double click GMER.exe.

http://img.photobucket.com/albums/v666/sUBs/gmer_zip.gif

[*] If it gives you a warning about rootkit activity and asks if you want to run a full scan…click on NO, then use the following settings for a more complete scan…
[*] In the right panel, you will see several boxes that have been checked. Ensure the following are UNCHECKED …
[] IAT/EAT
[] Drives/Partition other than Systemdrive (typically C:)
[*] Show All (don’t miss this one)

http://www.geekstogo.com/misc/guide_icons/GMER_thumb.jpg

Click the image to enlarge it

[*] Then click the Scan button & wait for it to finish.
[*] Once done click on the [Save…] button, and in the File name area, type in “ark.txt”
[*]Save the log where you can easily find it, such as your desktop.
Caution
Rootkit scans often produce false positives. Do NOT take any action on any “<— ROOKIT” entries
Please copy and paste the report into your Post.

If you haven’t already got this software (freeware), download, install, update and run it and report the findings (it should product a log file).

• 1. MalwareBytes Anti-Malware (MBAM), On-Demand only in free version http://download.bleepingcomputer.com/malwarebytes/mbam-setup.exe, right click on the link and select Save As or Save File (As depending on your browser), save it to a location where you can find it easily later. - 2. SUPERantispyware (SAS). On-Demand only in free version.

Don’t worry about reported tracking cookies they are a minor issue and not one of security, allow SAS to deal with them though. - See http://en.wikipedia.org/wiki/HTTP_cookie.
Also available a portable version of SAS, http://www.superantispyware.com/portablescanner.html, no installation required.

[system]

Thank you
I found out HijackThisLog that i had a malware
HKEY_CLASSES_ROOT\exefile\shell\open\command"%1" %*
it executes this
Malware Bytes showa no malware !!