Cannot Turn on Automatic Updates in Windows XP after Installing SP2
On most Windows XP computers, automatic updates are turned off as soon as you download and install Service Pack 2. The reason behind this is that several files are disassociated with the system registry while you install the Service Pack.
The problem can be resolved using the RegSvr32 command from the command prompt. To access the command prompt, click Start, select Run and in the Run Dialog box, type cmd and click on OK. A black screen will appear that resembles the old DOS interface.
You need to re-register the following files using the command:
You will have to run the RegSvr32 command for each file. To register a file, type RegSvr32 followed by a space and then the filename.dll. After typing the command, press Enter.
For example, to re-register the first file, type RegSvr32 wuapi.dll at the command prompt and then press the enter key.
Once you re-register all the files, you need to type EXIT to close the command prompt. After closing the window, reboot and then go to the control panel to turn on the Windows Update. This should solve the problem. If you are still not able to enable the Windows Update, you might have the Conficker virus on your system.