Hi,
This is a bug in the 7.0.1 Windows agent build, fixed in 7.0.2, which was released today. Upgrading the agent brings back the correct version, build and product name.
Here's what's actually happening: Windows reports itself as Windows 8 (6.2.9200) to any program that doesn't declare support for newer Windows versions in its application manifest. The 7.0 Windows build moved to a new toolchain, and the 7.0.1 agent shipped without that manifest. It's back in 7.0.2.
Note: on 7.0.1 the agent also skipped Windows Store apps in software inventory, because it thought it was running on Windows 8. If you have inventory enabled, the first configuration poll after the upgrade will show those packages as newly installed. That's expected, nothing was actually installed.