[squashme] Enhance Windows build instructions

Tester feedback has helped shape this.

doc/build-windows.md

@@ -42,6 +42,9 @@ After the bash shell is active, you can follow the instructions below, starting
 with the "Cross-compilation" section. Compiling the 64-bit version is
 recommended but it is possible to compile the 32-bit version.
 
+Some people have reported trouble with these steps and recommend that you apply all relevant Windows updates. Also be sure
+to enable virtualization in your BIOS if necessary.
+
 Cross-compilation
 -------------------
 
@@ -59,6 +62,16 @@ A host toolchain (`build-essential`) is necessary because some dependency
 packages (such as `protobuf`) need to build host utilities that are used in the
 build process.
 
+## Get the Source Code
+
+To build Dogecoin from source code, you'll need the source code. Either check it out via `git` or download
+a zip file. (Look at the green "<> Code" button on [the Dogecoin GitHub repository](https://github.com/dogecoin/dogecoin/)).
+
+Make sure this code is available in your Ubuntu directory. If you've unzipped a single downloaded file, you may need to change
+the permissions of all extracted files with command like:
+
+  sudo chmod -R <your_username> .
+
 ## Building for 64-bit Windows
 
 To build executables for Windows 64-bit, install the following dependencies:
@@ -77,6 +90,10 @@ example /usr/src/dogecoin, AND not under, for example, /mnt/d/dogecoin.
 If this is not the case the dependency autoconf scripts will fail (silently.)
 This means you cannot use a directory that is located directly on the host Windows file system to perform the build.
 
+To identify your version of WSL, run the command:
+
+  wsl -l -v
+
 If using WSL 1, you'll need to turn off WSL Support for Win32 applications temporarily, or you will get ABI errors and format errors for some .o files.
 
 If using WSL 1 then build using:
@@ -101,11 +118,10 @@ If using WSL 2 then you should be able to build just with:
     CONFIG_SITE=$PWD/depends/x86_64-w64-mingw32/share/config.site ./configure --prefix=/
     make
 
-Note that you can use the `-j` flag with any `make` command to build in parallel. For example, `make -j4` can use up to 4 cores/threads, if your
-processor supports that. This can speed up building, but it can be more difficult to find warnings and errors.
+In either case, be aware that if the first `make` invocation fails, you will see further errors during the `./configure` and second `make` stages. Please
+report any errors with this in mind.
 
-Be aware that if the first `make` invocation fails, you will see further errors during the `./configure` and second `make` stages. Please report
-any errors with this in mind.
+Also be careful using the `-j` flag with any `make` command. People have reported strange compilation errors when doing so.
 
 ## Building for 32-bit Windows