Improve and update windows text in INSTALL.md

INSTALL.md

@@ -563,23 +563,21 @@ fix is known. (One can type `POW(a,b)` for `a^b`.)
 
 ## Problems specific to Windows
 
-### Cut and Paste does not work
+The best way to use GAP in Windows is to use the "Windows Subsystem for Linux",
+also known as WSL. This can be found in the "Microsoft Store" in Windows, and
+allows you to install a full copy of Ubuntu. You can then follow the guidance
+for building and using GAP in Linux inside WSL.
 
-You might want to try different shells, using both of the two `.bat`
-files in the `bin` directory: `gap.bat` and `gapcmd.bat`. Also,
-<https://www.gap-system.org/Faq/faq.html#4> might give a remedy.
+We also support building GAP using 'Cygwin', which is a UNIX wrapper for
+Windows. Cygwin is used for making Windows release. Almost all packages are
+supported in the Windows releases.
 
-### GAP does not work in the remote desktop
+By default the Windows release reads and writes files from the user's
+"Documents" directory.
 
-GAP cannot be started in the Windows Command Prompt shell (via `gapcmd.bat`)
-in the remote desktop. To start GAP in the remote desktop, use the script
-`gap.bat` which should work in such setting.
-
-### You get an error message about the `cygwin1.dll`
-
-GAP comes with a version of this dynamic library. If you have another
-version installed (use "Find"), delete the older one (and probably copy the
-newer one in both places).
+The windows release can be installed globally for all users, or just for the
+current user. This is the best way to install GAP on a machine where you do
+not have administrator access.
 
 ### Something else went wrong