when i am in the safe, i know that the cetificate for windows defender has expired. i instead down loaded microsoft security essentials.my question is, can i take visa service pack 1 out and redownload service pack 2 and than reinstall it. i want to get rid of the expired certificate and if i do not need vista service pack 1, take it all out if it is obsolete. 1 am running scans thru the command prompt, is there a good way thru that or the new 3.0 console.