Ah so it is infected with VBS:Solow, which is a worm. This usually spreads through removable drives and places another file in the windows folder and creates a registry entry to run that VBS file on startup, since avast didn't find anything in the windows folder or other locations on your hard disk it probably caught it and stopped it from spreading.
You say you can't see the E:\Bit@UOM.dll.vbs file, which may well be correct depending on your response when avast detected it. You should have had a number of choices, Move to chest (best), Delete (worst), Repair (only if possible and not in this case), etc. What choice did you select ?
The autorun.inf file is just a text file so it can be edited with notepad or any text editor. I would imagine that it has an entry to run the E:\Bit@UOM.dll.vbs visual basic script file (which hopefully avast dealt with), remove that line, save and exit. If there is anything else in the file post the contents here and we can have a look at it.