Yikes, the currently accepted answer is over-complicated. Here's how to get the version of the current windows (with build numbers) quickly and reliably without requiring manifests and other nonsense tricks. And works on Windows 2000 and newer (i.e. every version of Windows in existence).
I am running SketchUp on a Mac but like to run it in parallel Windows instead because I will also be running Aspire software. When I open SketchUp in windows with parallel, I still get the Mac version. How do I get the Windows version through parallel?
Fill out your profile so we know what Mac OS and what hardware you are on. Have you downloaded the windows version of SketchUp and installed it on the partition of the drive that you have allocated to parallels?
I did at one time run SketchUp in parallels but that was years ago. It was not fantastic.