I need help with installing Windows XP service pack 3. I have tried numerous times and get a error code .?

That error code is usually associated with a problem validating your windows product.

First make sure you are malware free. Run your antivirus and antispyware products then you clear your cache (cookies, temp files, etc). Reboot. Then try running the diagnostic direct from Microsoft at the webpage below to see if that resolves your issue and allows you to install SP3

http://www.microsoft.com/genuine/diag/

If you still cannot download and install after the above, Microsoft provides free support when it is in regards to security updates. The following inforamtion is located in the support section of the webpage below:

Customers in the U.S. and Canada can receive technical support from Microsoft Product Support Services at 1-866-PCSAFETY. There is no charge for support calls that are associated with security updates.

• International customers can receive support from their local Microsoft subsidiaries. There is no charge for support that is associated with security updates. For more information about how to contact Microsoft for support issues, visit International Help and Support.

http://www.microsoft.com/technet/security/bulletin...

Check the following link for info on this problem and a cure.

http://simple-pc-help.com/support/runtime_0x802420...