Can't install .net 3.5 SP1 on Windows 7

I need to upgrade Sage50 on a Windows 7 Pro workstation and it asks for .net 3.5 sp1, however, when starting the executable it does not do anything. I have removed the .net 4.2 but I can't seem to get the 3.5 installed, have downloaded many times from the web. Any ideas?
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jdffAsked:
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JohnBusiness Consultant (Owner)Commented:
The other thing you might try, in addition to my earlier suggestion is to open Control Panel, Programs and Features, Windows Features.

Uncheck the main .NET Framework settings, close out, restart the computer, go back, enable .NET Framework, close out, restart again and run Windows Updates.
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JohnBusiness Consultant (Owner)Commented:
Download .NET FX Setup Verifier from http://blogs.msdn.com/b/astebner/archive/2008/10/13/8999004.aspx and run the tools. Check all the .NET possibilities in the pull down and see if it can repair .NET for you.
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RaminTechnical AdvisorCommented:
I would install .net 3.5 right after installing Windows (before installing anything else) ,
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RaminTechnical AdvisorCommented:
If NET Framework 3.5.1 is not listed in the Turn Windows features on or off then you might need to do  Windows Repair install using a Windows media.

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Shaun VermaakTechnical Specialist/DeveloperCommented:
Insert your installation media and run the following (where D: is the installlation media)
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:d:\sources\sxs

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jdffAuthor Commented:
it worked.
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JohnBusiness Consultant (Owner)Commented:
Thanks very much and I was happy to help you with this.
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