These are placed there as a result of downloading updates from M$, if you look in ADD/REMOVE you can match up the numbers, I have never deleted any so I cannot answer that question.
Hi, I have a laptop running windows xp home. Under my windows folder I have a ton of folders which say $NtUninstalkB817778$, the beginning is the same but the numbers are different. Can I delete these files?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic