Okay people i have had the same problem that you all have been having "how do i remove messenger beta"?
To get rid of eg Windows Live Beta 9 you will not be able to do this via add remove programs on Xp ect.
"When you 1st installed messenger 9 you had to click on that insalation engine an let it run to ya pc, to rid of beta you still need that installer engine that was on your desktop understand.
You Have to.....
1. find it.
2. If you deleted it get it of the site you downloaded it on last!
3. That launch engine is on you desktop right click on it as if you wanted options for it, an in the drop list menu you should find unistall an it will get rid of messenger beata!!!!
Hope that helped you