Resolved Windows update won't install

I have an update that I have been trying to install for about a week and it won't work. The update is a security update for Windows XP, KB2229593. After trying to install it, I get the result of "Some updates could not be installed." When I checked my update history at the Windows Update site, it showed an error code 0x8007F0DA. My computer seems to be running fine, but seeing that little yellow update symbol in the task bar constantly is kind of annoying. Any suggestions will be appreciated.

 

Hello There, I don't know if that update is an important one or not. But I can suggest you to download the update manually and then try installing. If you have 64 bit pc, click here, http://www.microsoft.com/downloads/...36-9DED-4820-BAC4-2D68877EE76C&displaylang=en
If you have 32 bit pc, click here, http://www.microsoft.com/downloads/...BB-0ECF-4467-A3BA-6FB862F603C5&displaylang=en

 

Excuse my ignorance, but how do I know if my pc is 64 bit or 32 bit?

 

Downloading and updating it manually seems to have solved the problem. Thank you for the assistance.