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[Marc Durham <619679@xxxxxxxxxxxxxxxxxx>]

I had this same problem, also running Windows 7 x64.
I noticed my "Volume Shadow Copy" service wasn't running, but that didn't fix it.
Then I tried running nunit "As Administrator" (I'm using the nunit-x86.exe) (I figured it had to create some temp folders in my project folders)
And now it works.

Hope it helps.

-- 
NUnit 2.5.7.10213 GUI TestRunner Locks Test Assembly
https://bugs.launchpad.net/bugs/619679
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Status in NUnit V2 Test Framework: New

Bug description:
After opening and running an NUnit project in the GUI test runner I am unable to build my solution in Visual Studio. The build fails with the following error.

Unable to copy file "C:\Projects\Foo\Foo.Bar\bin\Debug\Foo.Bar.dll" to "bin\Debug\Foo.Bar.dll". The process cannot access the file 'bin\Debug\Foo.Bar.dll' because it is being used by another process.

Foo.Bar.dll is the assembly under test, my tests are in a separate assembly, Foo.Bar.Tests.dll which has a referrence to the Foo.Bar project.

I have to close the NUnut project, rebuild then reopen the project. 
This was not an issue in NUnit 2.5.3 (2.5.3.9345). The GUI would not lock an files, rebuilding the solution triggered a reload of the assemblies.