Ok I Update my AMD catalyst and it requires .Net Framework 4.0 so i down loaded it and i noticed it downloaded .net framework 4.0 client profile and .net framework 4.0 extended. do I need .net framework 4.0 extended or and i delete it?

Yes...leave it. You should also check Windows update for more current versions. You could also read this > http://forums.amd.com/game/messageview.cfm?catid=444&threadid=162109&enterthread=y

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As far as I know extended is only needed if you're a programmer and you develop .net applications. Still, I suggest the same as Stumped. Unless you have serious problems with lack of hard drive space, just leave it. It doesn't bite or hurt and you can be sure every .net application can find what it needs.

Of course if you want to get rid of it, you can. If anything stops working, you just reinstall it anytime.

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