lost file and error running avast

Avast Free Antivirus / Premium Security
1

Using XP SP2. I was scanning and got an alert that the logonui.exe file was infected and moved it to the chest. There were many more, but I ignored them-infected with Virut. Since I had just installed Avast, I wanted to see what would happen with just the 1 file. I couldn’t find a chest. Then I got notification that I needed to restart my computer after I got an update, so I did. Upon start up, it asked for a password (have no idea what it is and had never been asked for one before). I hit ok and it continued start up. Then I got a window that says avast! detected unauthorized modification of this program file (C:Program Files\Alwil Software\Avast\ashAvast.exe). Continuing can be dangerous. Run the program anyway? I tried to find the file in chest and discovered in my windows file that I have a lot of these in blue (about 75):

$NtUninstallKB824105 -various different numbers after B

What do I do? I’m afraid to uninstall that I may lost the logonui.exe file although I can’t find it anyway.

Thank You!

2

Start avast antivirus, right click the skin, choose the Chest option.

If I’m not wrong, Virut is a very bad executable files infector.
You must get clean as soon as you can.

If a virus is replicant (coming and coming again), you could follow the general cleaning procedure:

  1. Disable System Restore on Windows ME or Windows XP. System Restore cannot be disabled on Windows 9x and it’s not available in Windows 2k. After boot you can enable System Restore again after step 3.

  2. Clean your temporary files. You can use CleanUp or the Windows Advanced Care features for that.

  3. Schedule a boot time scanning with avast. Start avast! > Right click the skin > Schedule a boot-time scanning. Select for scanning archives. Boot. Other option is scanning in SafeMode (repeatedly press F8 while booting).

  4. It will be good if you download, install, update and run AVG Antispyware. Some users recommend SUPERantispyware, Spyware Terminator and/or a-squared (take care about false positives).
    If any infection is detected, better and safer is send the file to Quarantine than to simple delete than.

  5. If you still detecting any strange behavior or even you’re sure you’re not clean, maybe it will be good to test your machine with anti-rootkit applications. I suggest AVG, Panda and/or F-Secure BlackLight.

  6. Also, if you still detecting strange behaviors or you want to be sure you’re clean, maybe making a HijackThis log to post here and, specially, scan and submit to on-line analysis the RunScanner log would help to identify the problem and the solution.

  7. After you’re clean, use the immunization of SpywareBlaster or, which is better, the Windows Advanced Care features of spyware/adware cleaning and removal.

  8. Finally, when you’re clean, check for insecure applications with Secunia Software Inspector to update insecure applications and avoid reinfection.