Antivirus scan forever

I work as an IT support technician, I had this problem with two pc's having two antivirus programs, the first one had AVG antivirus(AV) and the other had Kespersky AV, both using XP profesional SP2, the problem was  that when i try to scan these pcs it took a very long time and it doesn't finish scanning for viruses, it appeares that it keeps scanning a specefic area over and over again What is the cause of this problem and how I can avoid it in the future?
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manvip147Asked:
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rpggamergirlCommented:
It's normal for the scan to take a long time, sometimes an antivirus scans can also hangs at certain directory or files, like for example the System volume information directory, which is why Symantec suggests to turn off System Restore before scanning the system.

In which specific area does the scans get stuck?
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fishadrCommented:
Try looking at the logs - or switching logging on in the AV software. It is possible that you are trying too scan something that you do not have access to. The logs should identify where the AV software is up to and if it is having problems with some files or folders. It will also point out if the actual software has finished scanning, is re-scanning or taking a long time to complete. On many computers with large disks and lots of files the scanning will run for up to a day - especially if the computer is being used as previosuly said it may not have finished.


Another option is that the area that it is constantly scanning is constantly being updated - again the logs should point you in the right direction

If this does not work try downloading and running the Windows Malicious Software Removal Tool from Microsoft and check if it finds and trojans. It could be that you have something nasty that is preventing the AV Software from running correctly.
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manvip147Author Commented:
dear rpggamergirl & fishadr:

when i was scanning the pc using AVG it was stuck on the Guest documents folder, and this folder was strange because when i try to see its size it keep on growing from 1 MB to 500 MB and it doesnt stop (strannge!!)...but to be honest i think system restore was on, but again i have pcs on my office and i scan them on regular basis but they dont take 16 hour (as it happens with Kespersky Av and also i think that restore was not diables also).
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rpggamergirlCommented:
So I see, the scan hangs at the guest folder?
I suggest you can either exclude the "guest' folder from being scanned,
Or, if no one is using the Guest account, then just delete the guest folder, it will be recreated when someone uses the Guest account.
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fishadrCommented:
Best to delete the folder as it should not be used and may have something in it that is unsafe. If you exclude it you will still leave the problem there but just wont know about it.
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manvip147Author Commented:
thank u for your replies but again.....why did the guest folder had that problem?? and why when i scan my pcs at work they dont take more than 2 hrs to finish...i use also AVG on one pc and i had also Norton AV on my laptop....?? i think therfe is a problem...maybe its system restore...but I have it activated on my pcs and they don't take that long time to scan.
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rpggamergirlCommented:
It could be because the guest folder had been corrupted.
Have you deleted the guest folder yet? Try deleting the folder, and if problem persists, and if the scans also hangs at System Restore, then try flushing your restore points and see if the problem goes.

You didn't say that the scans hangs at system restore, but it's common for antivirus scanners to hangs at system volume information folder that's why many antivirus developers like Symantec, TrendMicro etc recommends System Restore to be turned off before scanning the system.
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manvip147Author Commented:
ok good point but how can i now thw the long scan time is due to system restore? what indicates that?, and as u said if the folder is corrupt it keeps on size increasing...so it is not a virus. and yes i'm sure it hange at system volume information .
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rpggamergirlCommented:
>>>how can i now thw the long scan time is due to system restore? what indicates that?,<<<

You said, you're sure it hangs at system volume information. System Volume Information folder is where your restore points are stored.
So just turn off system restore to flush all your restore points(this will delete all your restore points) then immediately create a new restore point.

The link below shows you how to turn off and turn on system restore:
http://support.microsoft.com/kb/310405

Steps to turn off System Restore:
1. Click Start, right-click My Computer, and then click Properties.
2. In the System Properties dialog box, click the System Restore tab.
3. Click to select the 'Turn off System Restore' check box. Or, click to select the Turn off System Restore on all drives check box.
4. Click OK.
5. When you receive the following message, click Yes to confirm that you want to turn off System Restore:
6. Reboot


Steps to turn on System Restore:
1. Click Start, right-click My Computer, and then click Properties.
2. In the System Properties dialog box, click the System Restore tab.
3. Click to clear the "Turn off System Restore" check box. Or, uncheck the 'Turn off System Restore on all drives" box.
4. Click OK
5.  Immediately crate a New restore point.
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