After downloading free verrsion, ran boot-time scan which has disabled my computer. After Windows XP logo appears the computer begins automaic restart. I tried F8 & F12, safe mode, last configuration, etc with no success. Finally got to this message after disabling auto restart:
Error message:
Stop: c0000221 {Bad Image Checksum}
The image urlmon.dll is possibly corrupt. The header checksum does not match the computed checksum.
Well I can’t really see why a problem with urlmon.dll, corrupt, missing or otherwise would cause the computer not to boot, so that is a bit of a mystery.
During the boot-time scan was any infection found ?
If so check this file using notepad and post (copy and paste) the malware name, file name and location of any detections.
Have (or did) you another AV installed in this system, if so what was it and how did you get rid of it ?
It is possible if you had two resident AV scanners installed (or remnants of the old one) it could cause a conflict, this could be as severe as to lock the system during boot, but that would be somewhat different to the error you ended up with.
Previously had an expired free Avast version only. Downloaded and installed new version without incident. Then ran boot-time scan. The scan was so slow I left computer for an hour. When I returned it was in the autostart rooutine where it boots up, starts to load Windows XP then apparently fails and shuts down, only to automatically restart. That’s all I know except the error message I found when I stopped the automatic restart using the F12 key.
Did you not check the file I asked you to about the boot-time scan. though if it rebooted, it would indicate that the boot-time scan didn’t find anything, another reason to confirm that by posting the contents as suggested.
Based on what you said I believe this is unrelated to avast but coincidental as avast doesn’t modify files, but scans them. Files can get corrupt for many reasons, most commonly a crash whilst the file is in use, but there are many others.
See the hits on google relating to this error and urlmon.dll, http://www.google.com/search?q=Stop%3A+c0000221+{Bad+Image+Checksum}+urlmon.dll and http://www.experts-exchange.com/Operating_Systems/Q_21394989.html.
See image of the details (file version number) of my copy of urlmon.dll, located in the windows\system32 folder on XP Pro SP3. You could try and find out the details of your version and try and obtain a copy from somewhere like http://www.dlldump.com/dll-files/U_3.html.
What version of IE are you using ?
Thanks for your help but I cannot look at any files or use the computer at all at this point because it will not operate at all - it gets to the Windows logo and restarts.
Is there a way to view files from the boot menu?
I found this on another forum:
“Error 221 means that there is a corrupt file on your hard drive. Since it is halting Windows it is an important one, perhaps a driver.”
I conclude that the Avast virus scan is responsible for disabling my computer by deleting a Windows driver. My only option now appears to be reformating the hard drive and losing everything on the drive.
Overinstallation can solve the problem and you won’t lose your programs, settings, data, files, etc.
Just choose ‘Repair’ installation of Windows and install ‘over’ the old installation.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;315341
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q314058
http://support.microsoft.com/?scid=kb%3Ben-us%3B315341&x=15&y=0
http://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/tips/doug92.mspx
This is what annoys me, this file essentially IE related shouldn’t stop a boot, that is crazy. However, the problem with IE is that it is integrated into the operating system, so because of this integration it could well stuff up your OS.
Are you able to boot into safe mode ?
Booting into safe mode http://www.pchell.com/support/safemode.shtml
If you have your original Windows OS disk you could try running this command from Windows Run and type sfc /scannow. This is the system file configuration and checks for things like your problem. Or the repair installation Tech mentioned.
This may be able to be run from safe mode (but I really don’t know) and if it finds a problem it would try to extract that file from the windows CD and replace the bad one. This would leave you with a slight problem in that this file might be old and not up to date so you would need to visit windows update, etc. which isn’t very good. That is why I suggested trying to get a replacement file that matches the version you have to avoid that. Even then it may not be easy to actually replace that file, I don’t know.
Sorry but your conclusion is flawed as a) if it finds an infected file it would alert you to it, b) it doesn’t take autonomous action you have to say what action to take, even in the boot-time scan, c) you said that windows had tried to restart; as I said earlier the only way that would happen is if the scan had completed successfully or it would have been waiting for your input if it had found an infection.
Thanks. That makes sense but what happened is that the computer worked fine until I started the Avast scan, left for one hour, and returned to find the computer in an autostart do loop.
Toshiba Satellite A105 did not come with Windows disk.
Thanks again I appreciate the help.
Can you use Windows system restore?
no I cannot do anything but F8 & F12 on boot
With F8, you can boot in Safe Mode and then use the system restore, can’t you? ???
cannot boot in safe mode either. I tried every option on F8 & F12 (the only things that the computer will execute) and none work, they all result in computer shut down and auto restart. If I disable the auto restart I get the error message shown in my first post.
Thanks anyway
Overinstallation can solve the problem and you won’t lose your programs, settings, data, files, etc.
Just choose ‘Repair’ installation of Windows and install ‘over’ the old installation.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;315341
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q314058
http://support.microsoft.com/?scid=kb%3Ben-us%3B315341&x=15&y=0
http://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/tips/doug92.mspx
I am having a similar problem.
I have two home computers and installed and ran Avast on both. The one on which I am typing this acts almost like a new computer now, but the other one promted me to rebot the computer with a scheduled sca due to a virus in the active memory and, when I rebooted it, it got as far as the Windows XP screen and then shut down.
I have tried several times to reboot it. I have tried every option listed under the F8 section and it is still shutting down after the Windows XP screen.
To my knowledge there was no anti-virus left on that system. I am 99.999% certain I removed it all.
I understand that reloading the system on top of itself should fix this. However, it is a Microsoft certified refurbished model and did not come with a copy of the software.
My question is, is there another option here. If all else fails, I suppose I could purchase a copy of XP but, if at all possible, I would like to avoid doing that.