Sunday, August 29, 2010

High CPU Usage From DNS Client

Some MS Windows installations run slowly for several minutes, particularly after start-up or resumption from power savings mode. After several minutes, CPU usage will drop and the system will run normally. This may be caused by local caching of DNS lookups, which can be disabled. There will typically be no detrimental effects.

In task manager, look for 100% CPU usage by svchost.exe. The user name is NETWORK SERVICE.

Start Button --> Run --> services.msc

Right-click on "DNS Client", and choose "Properties".
Change "Startup Type" to "Disabled".
Either restart the system, or press "Stop" button.

Tuesday, August 17, 2010

Recover Lost Windows System File

A virus scanner removed the MS Windows rundll32.exe file. The system still booted and would run, with many annoyances.

How to replace MS Windows \WINDOWS\system32\rundll32.exe

Error message identifying missing file:

File is missing:

Open a command prompt and run System File Checker.
Start Button --> Run --> cmd
At command prompt type: sfc /scannow

With the installation CD in the CD drive, expand the file from CD to the MS Windows installation.

File rundll32.exe has been restored, with a current time stamp.

While not necessary, set the file attributes to read only.