A hotfix is a patch that addresses a specific issue. This is in contrast to a service pack or rollup, which bundles several fixes into a single package.

to make sure its secure and work fine ( choose hotfix update )

Hotfix files can be removed but not recommended in case something happens in a new update and have to revert to an older update. Many of the Hotfix files/programs can be found in the add/remove programs list. From there you should be able to delete them. The files also like to hang out on other places within windows so you need need to do a file search to find them all.

"http://wiki.answers.com/Q/Explain_the_difference_between_a_service_pack_a_hotfix_and_a_patch"

Look at:

Automatic way:

http://dougknox.com/xp/utils/xp_hotfix_backup.htm

Manual Way:

http://users.beagle.com.au/alvian/remove_winupd_backup.html

Hope that helps!