Counter-Strike Source installation Fix and problem

Hi everyone.
So, most people have this problem that the installation doesn't work and the computer starts to slow down, also eating a lot of hard disk space.
So I'm glad to show you the fix for this.
However, I didn't found how to get the space back. But I know how to install.
First - Turn on your computer IN SAFE MODE. If you have Windows 8 you can go to the help & support thingy that comes with the computer and search for how to go to safe mode. Or you can just google it.
Second - Open the installer and follow the installation guide.
Easy as that. In safe mode somehow he can install Counter-Strike, but in normal mode he just starts doing what I said in the start. However this also happens frequently with other installers, not just with this one. So it's not a virus. 
Now, here's my problem.
When it is installed, I open Counter-Strike Source but it doesn't do anything. Both Half-Life 2 and Counter-Strike Source applications.
Any help would be very appreciated :/ Thank you!

Hello,

Thank you for sharing your fix!
What doesn't work exactly? Just a black screen or something? Try running them as an Administrator, or in Windows XP SP3 (or Windows 7) compatibility mode.