Windows Update Fails (XP)

I have been trying for two weeks to install the following updates:
810577 - Security Update
811630 - Critical Update (Windows XP)

They fail to install. It appears that they are downloaded, but will not install. I have tried about 10 times. It will just not work. All other updates install OK. Only these two fail.

Anyone have any suggestions?

Dell 8200
WIN XP Home
P4 1.8
512 Ram

Thanks

http://www.kellys-korner-xp.com/xp_abc.htm
you might try here, select W for windows update, scroll down to said topic and see if there is anything there that will help your situation

You can take a look at an earlier POST and see if Chief's suggested option will help you.

Thanks Fuelm@n and jman 1980.

Fuelm@n, your advice worked. I followed the instructions in the earlier post. IT WORKED! I deleted the catroot 2 folder and ran the update again. Both installed successfully. I went back and looked and catroot 2 was rebuilt.

Boy, this is a great place.