Update readme

Author: apsun

README.md

@@ -23,15 +23,24 @@ disable raw input when using AbsoluteTouch). As a result, AbsoluteTouchEx
 may trigger some anti-cheat protection systems. I am not responsible if
 you are banned for using AbsoluteTouchEx.
 
-## How to run
+## Running the project
 
-Ensure that `atloader.exe` and `atdll.dll` are in the same directory,
-then run the following command:
+Make sure you have the Visual C++ 2017 Redistributable installed. You can
+download the 32-bit version [here](https://aka.ms/vs/15/release/vc_redist.x86.exe)
+and the 64-bit version [here](https://aka.ms/vs/15/release/vc_redist.x64.exe).
+
+Choose the correct bitness of AbsoluteTouchEx to run. You must run the
+version with the same bitness as the program that you are injecting it
+into, NOT the bitness of your operating system! x86 is for 32-bit programs
+and x64 is for 64-bit programs.
+
+Ensure `atloader.exe` and `atdll.dll` are in the same directory, then
+run the following command:
 ```
 atloader.exe <path to exe to load>
 ```
 
-For example, to run osu!:
+For example, to run osu! (which, for the record, is a 32-bit program):
 ```
 atloader.exe %LocalAppData%\osu!\osu!.exe
 ```
@@ -48,6 +57,7 @@ Requirements:
 - Windows SDK and WDK (for HID libraries)
 - [Detours](https://github.com/Microsoft/Detours)
 
-You must build the project in the same bitness as the program you intend
-to inject the DLL into. For example, to inject into a 32-bit program, build
-the project in 32-bit mode.
+The project should open and build with no configuration necessary, assuming
+you correctly installed the dependencies above. A prebuilt version of Detours
+is included in the source directory; if you wish to update it you are
+responsible for building it yourself.