I posted on this topic a few days ago, but this time I have more information.
The issue was that a scan froze at a certain point, and didn’t finish - the only way I could exit Avast! was to use the Task Manager, or if that didn’t work, switch off the computer. I followed advice given (CCleaner, chkdsk and defrag before trying again) but the problem remains, to a large degree. I hope that the following extra information will allow someone get to the bottom of the problem for me.
I ran each scan (Quick, Standard, and Thorough) twice. The scan froze in the same place both times during the Standard scan, though not at all in either of the Thorough Scans and in only one of the Quick scans. I don’t understand why this should be, but that’s what happened.
I also noted the files that the stalled scans froze at: in all cases of freezing the file being scanned at the time everything froze was E:/Harmony/Documents/francais. E refers to a partition on my HDD, and Harmony is a musical composition program which I haven’t used for months, even years. I assume francais refers to a French language file, which I would certainly have never used - so I don’t think there can be anything amiss here.
For both Standard scans and only one of the Quick scans, freezing occurred when 94% of the scan had completed.
I also noted the following from the relevant report files in the Avast4 folder:
For the Standard scans (both of them) there was a long list of files unable to be scanned because they were password protected, but at the end there were some which mentioned a corrupted file, namely these three:
C:\WINDOWS\SoftwareDistribution\Download\f0ea9c6453e24bb53d66672cfca8db17\BITD.tmp\OUTLFLTR.msp\OUTLFLTR.DAT [E] CAB archive is corrupted. (42127)
C:\WINDOWS\SoftwareDistribution\Download\f0ea9c6453e24bb53d66672cfca8db17\BITD.tmp\OUTLFLTR.msp\OUTLFLTR.DLL [E] CAB archive is corrupted. (42127)
C:\WINDOWS\SoftwareDistribution\Download\f0ea9c6453e24bb53d66672cfca8db17\BITD.tmp\OUTLFLTR.msp [E] CAB archive is corrupted. (42127)
For the one Quick Scan which froze, the last 13 files in the report said anything about corrupted files, and they were:
Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\01_Tables [E] OLE archive is corrupted. (42145)
C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\QuickTime.cab\QTOLibrary.dll [E] CAB archive is corrupted. (42127)
C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\QuickTime.cab\QTUIPanelControl.dll [E] CAB archive is corrupted. (42127)
C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\QuickTime.cab\QuickTimePlayer.exe [E] CAB archive is corrupted. (42127)
C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\QuickTime.cab\Sample.mov [E] CAB archive is corrupted. (42127)
C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\QuickTime.cab\PictureViewer.exe [E] CAB archive is corrupted. (42127)
C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\QuickTime.cab\Sample.qtif [E] CAB archive is corrupted. (42127)
C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\QuickTime.cab\QTPlugin.ocx [E] CAB archive is corrupted. (42127)
C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\QuickTime.cab\QTTask.exe [E] CAB archive is corrupted. (42127)
C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\QuickTime.cab\PanelHelperBase.qpa [E] CAB archive is corrupted. (42127)
C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\QuickTime.cab\PropertyPanels.plist [E] CAB archive is corrupted. (42127)
C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\QuickTime.cab\annoanno.pdef [E] CAB archive is corrupted. (42127)
C:\Documents and Settings\NetworkService\Local Settings\Temporary Internet Files\Content.IE5\K3SV6DWI\QuickTime[1].msi\QuickTime.cab [E] OLE archive is corrupted. (42145)
Any help much appreciated! I would like to know a Quick or Standard scan will work properly when I run one. And I hate an unsolved problem!