Hello Centurion,
Delete the Battle.net Cache folder:
battle.net/support/article/6141
Delete the Battle.net Tools folder:
battle.net/support/article/6504
If the issue persists, take a look at this article and follow all the steps there, including the advanced:
battle.net/support/article/6300064
If you still have issues after that, please create a MSInfo file and paste the content on the thread:
battle.net/support/article/200581
You can paste the content of the file on a web like Pastebin and provide us with the link. :)