Your download is ****ed.

Just an FYI...

Game wont let me change any settings without black screening or just disappearing. I've tried every single "fix" on this forum and nothing works. Your **** broken.

it would be nice to know which "fix" you have tested till now

I can assure you it's your sh*tbox that's broken, not the client. Saying it as a person who downloaded the wotlk client and set up all his addons on 9 toons FROM SCRATCH.
1. General system condition
2. Drivers
Here's where you can start from.