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Windows 7: random high cpu usage with explorer.exe

01 Jul 2013   #1

Windows 7 Professional (64bit)
random high cpu usage with explorer.exe

as the subject states, explorer.exe randomly start eating up 50% of my CPU and l believe firefox is the culprit as closing it down usually resolves the issue. when it happens my system usually crawls for a few seconds then when l check the task manager explorer.exe is usually the service eating up 50% of the CPU.. closing firefox and re-opening generally fixes it however once (yesterday) when it happened closing firefox didnt help, in fact when l did suddenly other services like my antivirus started eating CPU instead however thats only happened once so far. l have downloaded and used process explorer to see what sub-service is eating CPU cycles but it shows nothing just that the service is running at 50% with no sub-service showing high usage which is annoying, however like l said it usually happens when running firefox but its started happening more often over the last day or so which has started getting annoying.

My System SpecsSystem Spec

01 Jul 2013   #2

Windows 7 Ultimate SP1 (64 bit), Windows XP SP3, Linux Mint 17 MATE (64 bit)
Corrupt Profile?

Have you tried using Firefox Safe Mode?
Firefox - Start Firefox in "Safe Mode"

Some Firefox problems are caused by corrupt files in your profile.
If you feel that FF is causing the problem, you could backup up your profile and create a clean profile.
If the problem goes away when you use the new profile, you could copy the important files from your old profile, into your new one.

Remember to create a backup before you start.

Have a look at these links:
Profiles - Where Firefox stores your bookmarks, passwords and other user data | Firefox Help
Transferring data to a new profile - Firefox - MozillaZine Knowledge Base

Some of the info in this tutorial may help you.
Firefox - Create and Run Multiple Profiles

Also, have you tried any of these things:
  • Scanned for malware/viruses?
  • Run "sfc /scannow"?
  • Checked if the problem occurs in Safe Mode?
My System SpecsSystem Spec
01 Jul 2013   #3

Windows 7 Pro. 64/SP-1

This might be of some interest. Because you are opening Task Manger to monitor Windows Explorer.

Igfxupdate.exe forces cpu to load @ 100% - Microsoft Community
My System SpecsSystem Spec

01 Jul 2013   #4

Windows 7 Professional (64bit)

the annoying thing about it is that lve seemingly fixed one issue to experience another.. it only really started when my mkv issue stopped however its started happening a little more since the recent firefox update. my original playback issue (which froze the system for a few seconds once per boot, tho intermittent it would always be the first mkv l opened tho it did happen to specific files) was seemingly resolved by disabling windows media player networking service.. tho not l have this issue lol.. will try redoing my profile.
My System SpecsSystem Spec
01 Jul 2013   #5

Windows 7 Ultimate 32-Bit & Windows 7 Ultimate 64-Bit


Lets see what is running on your pc

Click here DDS

Click on Download Now button

When the download is complete . Drag the DDS program from the Downloads folder to your Desktop

Double click the DDS icon on the Desktop then click the Run button to run the tool.

Place a check next to attact.txt and click Start . When done, DDS will open two logs
  • DDS.txt
  • Attach.txt

Save two logs onto your desktop and upload them with your reply
My System SpecsSystem Spec
01 Jul 2013   #6

Windows 7 Professional (64bit)

as requested, ran tool.

on another note, lve also created a new firefox profile.. admittedly in the last l had quite a few redundant addons l used it as an excuse to only use the ones l use regularly this time and the ones l cant do without like lastpass and xmarks.

Attached Files
File Type: txt dds.txt (19.7 KB, 6 views)
File Type: txt attach.txt (5.7 KB, 3 views)
My System SpecsSystem Spec
01 Jul 2013   #7

Windows 7 Ultimate 32-Bit & Windows 7 Ultimate 64-Bit

Didn't really find anything . Lets run RogueKiller to be sure

RogueKiller for 32bit or RogueKiller for 64bit

Click on one of the links above that goes with your Windows 7 bit versions

Save to the Desktop.

Close all windows and browsers

Right click on and choose

Press: SCAN

provide the RKreport.txt (Mode: Scan) in your reply.
My System SpecsSystem Spec
02 Jul 2013   #8

Windows 7 Professional (64bit)

run as requested, by the looks of it. nothing has been found if lm reading it right.

Attached Files
File Type: txt RKreport[0]_S_07022013_090521.txt (3.0 KB, 9 views)
My System SpecsSystem Spec
02 Jul 2013   #9

Windows 7 Ultimate 32-Bit & Windows 7 Ultimate 64-Bit

Run RogueKiller again and click on Delete .
My System SpecsSystem Spec
02 Jul 2013   #10

Windows 7 Professional (64bit)

while l have followed your advice, what will it delete? (l created a restore point none the less but l am curious.
My System SpecsSystem Spec

 random high cpu usage with explorer.exe

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