First disable the Windows scripting host, by deleting the wscript.exe, or replace that wsrcript.exe with eg. notpad.exe(rename the wscript.exe and than rename the notepad.exe to wscript.exe). Or you can use this Programm, let do it for you. http://www.symantec.com/avcenter/noscript.exe it will disable the vbs settings in the registry. Than restart, it will prevent the vbs virus to get startet. Check the autostartsetting for that VBS-Script and delete it.

Does Avast detect that VBS-Virus? If not you should send a copy of it to support@asw.cz and to the Pandasupport.