无法在Blend 3中运行示例项目

刚刚将Blend 3安装到XP sp3盒子上。
当尝试运行任何提供的示例wpf项目时，我收到以下错误 - （在这种情况下运行'Wall3D'
"无法复制文件"obj\Debug \Wall3D.dll"到"bin \Debug \ Wall3D.dll"。进程无法访问文件"bin \Debug \ Wall3D.dll" ;因为它正被另一个进程使用"在文件Microsoft.Commo第2606行。"
已经从默认的"只读"更改了文件夹权限，试图解决这个问题，但没有快乐。如果我无法在开发环境中运行/测试它，那么尝试开发任何东西都没有太多意义...... :(

Have just installed Blend 3 onto a XP sp3 box.
When trying to run any of the supplied sample wpf projects I get the following error - (in this instance running 'Wall3D'

"Unable to copy file "obj\Debug\Wall3D.dll" to "bin\Debug\Wall3D.dll". The process cannot access the file "bin\Debug\Wall3D.dll" becuase it is being used by another process" in file Microsoft.Commo at line 2606.

Have changed folder permissions from the default "Read only" to try and fix this problem but no joy.

Not much point trying to develope anything if I won't be able to run/test it in the dev. environment...:(