Just got vista ultimate, and i got all the updates but one of them.
Security Update For Windows Vista (KB936782) Failed

Says : A security issue has been identified in Microsoft XML Core Services (MSXML) that could allow an attacker to compromise you windows-based system and gain control over it. You can help protect you rcomputer by installing this update from microsoft. ...

WHere can i get it? am in danger? or is it a virus? please help thanks alot
tried to install, after i downloaded it manually and it says "The update does not apply to your system"

Can someone control my computer?

It could be one of 2 things:
1. there are 2 updates for that and you already have the newer of the 2
2. Microsoft just hates you. Try restarting and update again and if that fails try downloading it manually.