Is your feature request related to a problem? Please describe.

With #14439, it is possible to obtain processor architecture for the Windows instalaltion. This can replace os.environ["PROCESSOR_ARCHITEW6432"] in most situations. Currently environmetn variable is read in app module (is64BitProcess), COM registration fixing tool, and NVDA Helper library initialization.

Describe the solution you'd like

Use processor architecture string whenever possible. The only exception is update check where due to service pack string, sys.getwindowsversion() must be employed until NVDA moves to supporting Windows 8/10 and later. Or, provided that Windows 7 SP1 reports service pack minor version of 0 all the time, then winVersion.getWinVer() can be used in update check (note that on 32-bit systems, architecture string to be sent to NV Access server is empty).

Describe alternatives you've considered

Leave things as is.

Additional context

Checking for 64-bit Windows can be done by either:

• winVersion.getWinVer().processorArchitecture in ("AMD64", "ARM64")
• winVersion.getWinVer().processorArchitecture.endswith("64")