Clarified build instructions.

docs/build_vc_windows.txt

@@ -13,11 +13,16 @@ http://www.microsoft.com/downloads/details.aspx?familyid=FF6467E6-5BBA-4BF5-B562
 This step can be left out if you use MSVC 2008 Professional instead of the Express Edition.
 http://www.microsoft.com/downloads/details.aspx?familyid=4B78A58A-E672-4B83-A28E-72B5E93BD60A&displaylang=en
 
-4. Get open source QT 4.3.3 [zip file] from Trolltech.
+4. Get open source Qt 4.3.3 [zip file] from Trolltech.
 It supports MSVC 2008, no patch is needed.
 http://trolltech.com/developer/downloads/qt/windows
 
-Compile QT, make sure you set the QTDIR environment variable before.
+Set the QTDIR environment variable to your location of qt.
+Set the QMAKESPEC environment to win32-msvc2005
+(not 2008)
+
+Compile Qt.
+Add the Qt bin directory to your PATH environment variable.
 
 5. Get boost 1.34.1 and bjam (latest version) and compile boost
 See http://www.boost.org/more/getting_started/windows.html
@@ -33,9 +38,12 @@ perl Configure VC-WIN32 no-shared
 ms\do_masm
 nmake -f ms\nt.mak
 
+To build OpenSSL without assembler, consult the documentation.
 After compiling OpenSSL, move the output from inc32 and out32 to include and lib.
 
 7. Get and compile(!) (do not use precompiled version) SDL and SDL_mixer.
+Use the project files in VisualC.zip of the source package.
+Build both debug and release versions.
 
 8. Run
 qmake -tp vc -recursive