Click Start> Control Panel> (In classic view) Programs & Features/ Add Remove Programs. Scroll through the list of programs and locate the item or items labeled "Microsoft .NET Framework." If you have more than one version installed they will all be listed. The last one in the list is your most current version of the Microsoft .NET Framework. It should read something like this, "Microsoft .NET Framework 3.5 SP1." The SP refers to the service pack you have currently.
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