Your operating system is 'what version of Windows are you using' from the contents of the chest which you posted I can now see that you are using Windows XP.
The avast chest is made up of different sections, the System Files contains backup copies of important system files, they are used to recover if a virus infects the original. So these are no problem.
The Infected Files are where any infected files detected are placed and the one you gave earlier and should also give the virus name see image example sorry it is in English.
thekeys[1].htm c:\Documents and Settings\pc\Local Settings\Temporary Internet Files\Content.IE5\W96JWDEZ
Because this file was detected on your hard disk by the standard shield provider, then it wasn't intercepted by the web shield provider like I would have expected, this is why I keep asking if it is working/enabled. The operating system (Windows version) plays an important part in how this works.
Left (double) click on the avast icon, that should open the on-access providers window, select the Web Shield icon and it should show a Last Scanned: and Scanned Count: field these should contain something and the count should be greater than 0 if it is working, See image 2.
Reference your last post:
The virus in the chest isn't a problem, it can do no harm there, I'm concerned that there may be other problems, web shield not working and possibly something undetected on your system.
I can't do a remote connection to attempt a fix/check of your system.