Without more detailed information, it is almost impossible to say.
What are the file names, locations and malware names of the detections ?
Your error means that the detection found inside an archive (packed/compressed) file can't be extracted (and put the file pack together) without probable damage/corruption to the archive.
Look in the:
C:\Documents and Settings\All Users\Application Data\Avast Software\Avast\report\aswBoot.txt file (XP location)
C:\ProgramData\Avast Software\Avast\report\aswBoot.txt (Vista, Win7, may be a hidden location)
Check this file using notepad for info on the scan/detections, etc. and you can copy and paste the detection lines.
@@@@
Deletion isn't really a good first option (you have none left), 'first do no harm' don't delete, send virus to the chest (a protected area) and investigate.
There is no rush to delete anything from the chest, a protected area where it can do no harm. Anything that you send to the chest you should leave there for a few weeks. If after that time you have suffered no adverse effects from moving these to the chest, scan them again (inside the chest) and if they are still detected as viruses, delete them.
Here is a copy of the message i received in the boot scan.
File C:\Program Files\EarthLink Setup\Windows\access\SpywareBlocker.msi|>Data1.cab|>ElShowSpyAbout.exe|>[UPX] is infected by Win32:Malware-gen, Delete: Error 42111 {The operation is not supported for this type of archive.}, Delete: Error 42111 {The operation is not supported for this type of archive.}, Move to chest: Error 42111 {The operation is not supported for this type of archive.}, Move to chest: Error 42111 {The operation is not supported for this type of archive.}, Move to chest: Error 42111 {The operation is not supported for this type of archive.}, Repair: Error 42060 {The file was not repaired.}, Repair: Error 42060 {The file was not repaired.}
File C:\Program Files\EarthLink Setup\Windows\access\SpywareBlocker.msi|>Data1.cab|>SpywareBlocker.exe|>[UPX] is infected by Win32:Malware-gen, Repair: Error 42060 {The file was not repaired.}
File C:\System Volume Information\_restore{129201FA-B0AC-49B3-96B2-DEB8B91E727B}\RP1957\A0194811.msi|>Data1.cab|>ElShowSpyAbout.exe|>[UPX] is infected by Win32:Malware-gen
File C:\System Volume Information\_restore{129201FA-B0AC-49B3-96B2-DEB8B91E727B}\RP1957\A0194811.msi|>Data1.cab|>SpywareBlocker.exe|>[UPX] is infected by Win32:Malware-gen
File C:\System Volume Information\_restore{129201FA-B0AC-49B3-96B2-DEB8B91E727B}\RP1957\A0194899.msi|>Data1.cab|>ElShowSpyAbout.exe|>[UPX] is infected by Win32:Malware-gen
File C:\System Volume Information\_restore{129201FA-B0AC-49B3-96B2-DEB8B91E727B}\RP1957\A0194899.msi|>Data1.cab|>SpywareBlocker.exe|>[UPX] is infected by Win32:Malware-gen
File C:\System Volume Information\_restore{129201FA-B0AC-49B3-96B2-DEB8B91E727B}\RP1957\A0194904.msi|>Data1.cab|>ElShowSpyAbout.exe|>[UPX] is infected by Win32:Malware-gen
File C:\System Volume Information\_restore{129201FA-B0AC-49B3-96B2-DEB8B91E727B}\RP1957\A0194904.msi|>Data1.cab|>SpywareBlocker.exe|>[UPX] is infected by Win32:Malware-gen
File C:\System Volume Information\_restore{129201FA-B0AC-49B3-96B2-DEB8B91E727B}\RP1958\A0195040.msi|>Data1.cab|>ElShowSpyAbout.exe|>[UPX] is infected by Win32:Malware-gen
File C:\System Volume Information\_restore{129201FA-B0AC-49B3-96B2-DEB8B91E727B}\RP1958\A0195040.msi|>Data1.cab|>SpywareBlocker.exe|>[UPX] is infected by Win32:Malware-gen
Number of searched folders: 14928
Number of tested files: 951425
Number of infected files: 10
I have no idea what they mean or if they are doing harm. Thank you for your help.
bob