lol mine installed fine but i might have the answer for you guys.
1. Make a folder on your desktop and name it "OB"
2. Extract BOTH discs into your newly-made "OB" folder
3. Download AlluNeed.zip from:
http://filebeam.com/b5c18029d79f49492412be1b2776fb7d
4. Extract the contents of "SIMPACK_15" into your "OB" folder
5. Extract "TOB.bat" into your "OB" folder
6. Now run TOB.bat from inside your "OB" folder. Relax, grab a drink, this will take a while.
7. Once it's done, you should have a folder (OrangeBox) with a lot of files in: "C:\Games\OrangeBox"
8. Now back to the "AlluNeed.zip" you downloaded, you'll see a folder named "OrangeBox" in there.
9. Extract all the .BATs, Steam.dll, and hl2.exe into "C:\Games\OrangeBox"
10. Extract the 4 .dlls in the "bin" folder to "C:\Games\OrangeBox\bin"
11. Finally, go into the "ep2" folder. you'll see a "bin" folder and "cfg" folder
12. Extract the files in each folder to their corresponding folders in "C:\Games\OrangeBox\ep2"
13. Do the same for the other 4 games' folders. (named "hl2", "episodic", "portal", and "tf")
14. You're done with the AlluNeed.zip. YAY.
Now look for the steam apps folder copy all the file to your Legit Steam Apps folder. Start with 40mb update