Avast consume 100% CPU when get into a specific folder in my HDD

[dor123]

Every time, when i get into D:\Backup in my hard disk, Avast begins to consumes 100% CPU and large amount of memory, and this leads often to hanging up my computer (Stop responding), so i have no option but to reset the computer.
This continues even after i leaves that folder.
Why this is happening???

[DavidR]

What's on D:\backup, besides the blindingly obvious, e.g. is this a recovery partition or a partition/folder with many compressed files ?

You also don't say what type of scan you are doing, nor what the scan settings are ?
e.g. Quick, Full or Custom scan or any changed setting within the scans, Sensitivity, Packers, Scan all files, etc. etc.

[Asyn]

Every time, when i get into D:\Backup in my hard disk, Avast begins to consumes 100% CPU and large amount of memory, and this leads often to hanging up my computer (Stop responding), so i have no option but to reset the computer.
This continues even after i leaves that folder.
Why this is happening???

Which avast..??
Which version..??
Which OS..??

[dor123]

I use Windows 7 SP1 and Avast free 6.0.1203 (I can't change nothing in my profile other than the Account related settings).
My Avast begins to do this when i randomally get into this folder, which contains setup files of my programs and drivers and backups of Firefox data.

[Asyn]

Other security related software installed..??

[dor123]

Windows Defender.

[Asyn]

Hmmm...
Did you maybe change the initial avast! settings...??

[dor123]

I changed the initial settings of my Avast.

[igor]

How did you change them?

What if you scan the D:\Backup folder on-demand (e.g. from the rightclick scan from Windows Explorer), without entering the folder - does the same happen?

[dor123]

The scanning don't cause this problem.
When i simply enters the D:\Backup folder, Avast starts to consume 100% CPU, and as i stay longer in this folder, Avast consumes more CPU resources and begins to swell, in terms of memory usage and the computer gets slower.
If i continue to stay in this folder and to enter the subfolders or to run files from it, the problem got even bigger, eventually results in computer hanging up.
I setted Avast that it will scan all files and archives on access. However i don't find any reason for this, to cause Avast to consume 100% CPU and hang up the computer in a specific directory.
This looks to me more like a bug in Avast.

[Asyn]

Does it work, after you reset avast..?? (SETTINGS - Troubleshooting)

[dor123]

I don't want to reset Avast setting to factory default, because this can't be restored and this will delete any scheduled scan that i created.

[Asyn]

I don't want to reset Avast setting to factory default, because this can't be restored and this will delete any scheduled scan that i created.

Sorry, can't help you then.
Maybe igor has any better ideas.
Good luck..!

[igor]

Well, if you set all files to be scanned on open, and even all archives to be unpacked by the File System Shield... then it shouldn't be that surprising.
I mean, when you enter the folder, the file manager might start touching the files - so avast! has to scan them, and it may take quite a while for some archives (and certainly impose a heavy load on the machine). The load may start delaying other things the OS wants to do... and that's what you see.

[dor123]

When my Avast begins to consume 100% CPU, when i reaches D:\Backup folder, my HDD don't become busy and the main Avast screen displays that Avast isn't busy at all with scaning on access.
However a process called Sf.bin appears occasionally randomally in the task manager and takes 50% from the 100% usage of the CPU that Avast uses at that moment.