[Launcher not Working]

Seems to have fixed it. Thanks everyone for your help

[Launcher not Working]

I have recently downloaded the open beta, and everytime I open the launcher an error message comes up:

NSIS Error

Installer integrity check has failed. Common causes include incomplete download and damaged media. Contact the installer's author to obtain a new copy.

I have no idea how to fix this. Is it as simple as it says, redownload the game?

My Specs are:

OS-Windows 7

CPU-Intel i5 3.2GHz

RAM-4GB

Graphics Card-Nvidia Geforce GT 640