Has it not been included among the updates listed in Change or Remove Programs? That can happen unfortunately, which leaves little choice but a Sys Restore. Using the entry in Add/Remove Windows Components does not actually remove it; only remove access to it.
I don't think it was meant to be patronising ade.h, by default add/remove doesn't show the updates and if boblette doesn't know that then it would make sense to mention it.
Incidently boblette in case you do not realise Beta software is prerelease software. That is it still has bugs and has been released to allow the developers to sort the bugs out. Unless you know what you are doing I would strongly advise you not to download any Beta software but to wait for the full tested version.
This is not intended as any sort of slur on your computing ability just as a heads up in case you do not know. I wouldn't touch a Beta version of anything with a bargepole as it can cause too many problems. In my opinion its better to wait for the full thing.