Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have AVAST installed on Windows 7 and whenever I open a path e.g. D:{Directory}* which has substantial large files i.e. in excess of 200GB, CPU utilization jumps to 100% and it appears as though as Windows is attempting to list the files i.e. the green scrollbar is running across Windows Explorer (be keen to know the proper term).

I initially thought it may have been something to do with the search indexer however having looked at Task Manager, it was the AVAST service hogging all of the CPU. The only way I can prevent this is to disable AVAST which I don't or to stop a specific service within AVAST i.e. File Shield which monitors reads and writes continuously.

This did not use to occur in the past however seems more frequent now. I have run a scan on the host and no viruses have been detected nor malware. The host has approximately 4GB RAM.

share|improve this question
Are you hearing the HDD spin up as if it was asleep? – Raystafarian Feb 9 '12 at 19:00
When was the last time that you updated Avast? – EBGreen Feb 9 '12 at 19:06
@Raystafarian - Nope – PeanutsMonkey Feb 9 '12 at 19:07
@EBGreen - It is updated daily as it is set to automatic updates. – PeanutsMonkey Feb 9 '12 at 19:08
Is that definition updates daily or updates to the actual software? I don't use Avast so I am not familiar with it. – EBGreen Feb 9 '12 at 19:10
up vote 1 down vote accepted

Avast is scanning the files, especially if they are archives. Avast has an exceptions list, try adding the top-level folder to this exception list and see if the problem resolves.

share|improve this answer
Thanks. I figured so much but I don't want it to exclude the directory as files are being copied across all the time and they need to be scanned as those files are then backed up. – PeanutsMonkey Feb 9 '12 at 20:31

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.