For the completeness: what is the rest of your Standard Shield settings? (mainly, the second and fourth page)
1. page: All marked
2. page: Scan on open (?,{*},386,AD?,ASP*,ASX,BAS,BAT,BIN,CH?,CLA*,CMD,COM,CPL,CRT,CSS,DLL,DO?,EML,ECE*,EXE,HLP,HT*,INF,INS,ISP,JS*,MDB,MDE,MHT,MS?,NWS,OCX,OV?,PCD,PDF,PIF,PO?,PP?,PRC,PRF,REG,RTF,SCF,SCR,SCT,SHB,SHS,SWF,SYS,VB?,VSD,VXD,WS?,XL?), Always scan WSH-files, Scan Created/Modified, Only with selected ext, Default extension set, Additional extensions (?,ACE,ARC,ARJ,ASP*,CAB,ECE*,GZ*,LHA,LZH,RAR,TAR,ZIP,ZOO)
4. page: No marks, Excetions: *\PAGEFILE.SYS,*\WIN386.SWP,*\SYSTEM.DA?,*\USER.DA?,C:\WINDOWS\TEMP\*.TMP,C:\MSDOS.SYS,C:\WINDOWS\TEMP\_AVAST4_\UNP*,c:\progra*\zoneal*\zlclient.exe,c:\windows\system\vs*.dll,c:\windows\system\zonelabs\*.dll,c:\windows\system\zl*.dll