I'm trying to learn programming and I've decided to poke my head around in the LCS source code, but i'm not shure if I can. Do I have to use IE in order to get it? Also, what compiler would you suggest?
My suggestion is to use TortoiseSVN to download the source code and Microsoft Visual C++ as your IDE and compiler (the Express version is free, if you don't have it). You can see the first post for a detailed explanation of how to do this, including links to the two programs. If the IE question is because the Windows explanation mentioned Windows Explorer, that's just the built-in Windows interface for displaying and navigating folders and your desktop. TortoiseSVN integrates with it to add options to the Windows right-click menu. None of the process is browser based except installing the relevant programs, and your choice of browser won't impact things.
Another option for downloading the source code is to just go
here, scroll to the bottom, and click "Download GNU Tarball". You'll probably need something more fancy than WinZip to open it, but it contains the same files you'd get the other way. This method is easier, but the disadvantage of doing this is that you'll have to completely redownload and lose all your changes if you want to get a later version of the source code, which can get very annoying very fast. SVN avoids that by just updating the files that have changes, and merges your changes with changes other people have made. It's also a pretty bread and butter piece of software for many programmers, so if you're exploring programming, it's not bad to have a client installed -- it'll make it easier to download source code on many other open source projects as well. If you want to use another SVN client besides TortoiseSVN, you can do that too -- just give it the same URL from the explanation when you do the SVN checkout command. I recommend TortoiseSVN because it's by far my favorite SVN client, it's free, and it's easier to use than most alternatives.
The reason I suggest Visual Studio as your compiler and IDE is because you can just open the project file in the workspaces directory and it'll have everything already loaded into the IDE and ready to compile in one click. That there's a free version also helps.