On official site u can see that the most important is "Verify that you also have the latest update to Microsoft .NET Framework." and link to microsoft net framework 4.0. That's not quite true (i mean with Microsoft .NET Framework 4.0).

To play LoL u have to get:
1. Windows service pack 3
2. the latest update to Adobe air (from adobe site)
3.updated Microsoft .NET Framework 1.1
4. updated Microsoft .NET Framework 3.5
5. updated Microsoft .NET Framework 4.0
6. Direx 9.0c
7. plus everything what u can already read on official site

U need that three version of Microsoft .NET Framework because of unique MNF Liberties and u don't need 2.0 version because everything whats in 2.0 is in 3.5.

I posted that because maybe it will help to others who have launcher errors problem. If Administration think that post is not understandable because of mine horrible English feel free to delete (or rewrite) that post. Everything what u see upside is about playing on Windows XP. I don't know how it looks on Vista, Windows 7 etc.

I had a very frustrating problem just because i trusted this:

why dont they make league of legends playble with net framework 1.0 and abobe air 1.0

These programs are required:

• Internet Explorer 8
• Adobe Air
• DirectX9 (latest!)
• .net Framework 3.5

I spend all they from 11 hour to 23:10 hour to fix my problem with launcher coz it didn't load and I just now saw this post!!! And now I know what I need is just a stupid .net frame work 3.5 and launcher fixed !!! :@

Why ins't this thread stickied?

Why is IE required?! O.o

Pando isn't needed I uninstalled after installing the game.

why i need explorer 8 ?

Is windows SP3 requise???