Video card drivers are the software that allows your graphics card to work with your computer. If your drivers aren't up to date, they could be causing the game to crash. Updating your drivers may also lead to an increase in performance when playing the game.


If you don't know the manufacturer of your graphics card, press ⊞ Win+R and type dxdiag. You can find the manufacturer in the Display tab.
Visit the manufacturer's website to automatically detect your card and download the necessary drivers.

NVIDIA
AMD
Intel

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, Updates to Windows may fix problems with your DirectX or other operating system files. Keeping Windows up to date will generally make your system more secure and stable anyway, so it's good practice to keep things up-to-date.



Click here for detailed instructions on updating Windows.
 This is a software library from Microsoft that League of Legends requires. Manually installing version 3.5 may get League of Legends running again. Even if you have 4.0 installed, you may still need to install 3.5.



You can download .Net 3.5 here.
 League of Legends includes a tool that will rebuild your game files, potentially fixing problems with corrupted files.


Open the League of Legends Launcher.
Click the Gear button to open the Settings menu.
Click the "Repair" button. The repair process will take about 30-60 minutes.
 If you've set your graphics settings in the game too high, you may be overloading your hardware and causing the game to crash. Try lowering all of your settings to the minimum and seeing if your game becomes stable. If it is, you can start raising settings one-by-one until you find a good balance between stability and graphical effects.You can find the video settings by opening the Options menu while in game and clicking the "Video" button.
If you can't access the graphics settings because your game won't start, you can download a fan-made tool that will allow you to change League of Legends settings outside of the game. You can download it here.
 A virus or other piece of malware could be causing your game to crash. Sometimes, the easiest way to fix these kind of problems is to wipe everything clean and start over. If you have your important data backed up, you can have the entire process done in a little over an hour.



Click here for instructions on installing Windows 7.

Click here for instructions on installing Windows 8.

Click her for instructions on installing Windows Vista.
Update your video card drivers.
Install all Windows updates.
Install the .Net Framework.
Use the League of Legends Repair Tool to repair your game files.
Lower your in-game settings.
Reinstall Windows and League of Legends.
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