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svchost.exe cmd window appears spontaneously

Posted on 2006-06-15
Medium Priority
Last Modified: 2013-11-18
My XP machine (fully up to date with patches and service packs etc) has suddenly started - for no reason that I can see - popping up on the monitor a command prompt window headed c:\windows\system 32\ svchost.exe. The window is waiting for command line input and its current directory is C:\windows \system 32, but otherwise it doesn't seem to do anything. This behaviour doesn't happen often - maybe once a day - but it kind of worries me that there is something nasty loose in the machine - can anyone enlighten me as what might be happening.
Question by:SteveHodge
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LVL 59

Expert Comment

ID: 16911670
Follow the advice in this MSKB article to find out more about the processes that are running under svchost.exe:

A description of Svchost.exe in Windows XP Pro

First, do this:

1. Click Start on the Windows taskbar, and then click Run.
2. In the Open box, type CMD, and then press ENTER.
3. Type Tasklist /SVC, and then press ENTER.

Then communicate back the list of processes running under svhost.exe.
LVL 59

Expert Comment

ID: 16911686
Just to be safe, I would do a full virus/trojan/spyware scan:  Some free online virus scanners:




Also try these free programs to rid your system of spyware, trojans, and other malware:

Spybot - Search & Destroy

LavaSoft Ad-aware  

I use BOTH of the above programs on my 3 Windows systems; what one program misses, the other catches.  Also make sure to download the most up-to-date data before you run the programs.

Expert Comment

ID: 16911696
Also, check again that you have all updates....What other software have you installed?  Any .NET stuff?  Programming stuff?


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LVL 14

Expert Comment

ID: 16917889
see here for info on svchost

you quoted "c:\windows\system 32\ svchost.exe" - there should not be a space between "system 32", search for all svchost.exe files on your pc, if found anywhere besides system32 or i386 or an $ntservicepack folder - then it is suspect

Author Comment

ID: 16921390
Thanks experts

FriarTuk - thanks I checked all the svchost.exe files, none of them look wrong
System 32 was a mistype by me
Lee Tutor - ran spybot, adaware and McAfee. Got one trojan, and the usual crop of traclker cookies but nothing else nasty
When I run tasklist (with what ever switch, except the help one) I get "Error: Class not registered". What can i do about this???
AndreDeKolta - I sure I am up todate - everything is on auto-update, and the machine runs almost all the time

LVL 14

Expert Comment

ID: 16925993
boot into safe mode & do full virus & spyw scans, scanning all folders & files, including compressed
reboot & check
then boot safe mode command prompt & run "sfc /scannow"
reboot & check
boot from xp cd into recovery console & run Repair option

Author Comment

ID: 16967395

"boot into safe mode & do full virus & spyw scans, scanning all folders & files, including compressed
reboot & check"

Did this - all clean, no change to problem, tasklist /sfc still says 'Error -class not registered'

"then boot safe mode command prompt & run "sfc /scannow"
reboot & check"

sfc would not run in safe mode. Ran it in normal mode, all clean. Tasklist still the same

Also ran rootkit revealer - nothing odd execpt some mysterious registry strings containing nulls, deleted them
No change, task list still the same. Otherwise OK

"boot from xp cd into recovery console & run Repair option"

Did this. completed OK, but windows explorer wouldn't run properly anymore (TKU Microsoft). Long, long delays before it did anything at all. But tasklist /svc still did not work when run from task manager - same error message

Restored system from backup, running OK now, but task list still doesn't work.

Complete re-install looks the only option; quite a pain, don't want to do it unless I am sure tasklist will tell me something useful about the original problem and/or the re-install will clear the original problem. (The tasklist issue must be something in the installation because I have a back-up install of XP on this same machine and on that one tasklist runs fine)

What do you think?
LVL 14

Accepted Solution

FriarTuk earned 800 total points
ID: 16974312
hate to say it, but i agree - if you have an image or bkup that you can restore that works i'd use it

then update everything, including installing new apps, then make a new image/bkup

Author Comment

ID: 17030192
Did the re-install - aargh!!. There was something nasty loose in the machine, exploiting outlook express. I caught it polling my (in-house linux based) mailserver once a second with addresses taken from outlook exprss, which I only use for some very specialised purposes, so no real harm done.

It has stopped now, the svchost pop up hasn't reoccured, and tasklist now works. Only reformatted the C drive. I hope it is not lurking in one of the other drives, but time I guess will tell


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