Probably not the best place for this topic, but not wrong, I suppose... Okay.
You said you were using the website? What browser + version were you using? Perhaps a general physical world location would help, in case it's an ISP-caused issue.
Do you have the latest launcher/version of MBP? If so, then try this. Open MBP. Enter online. When prompted to login, choose to create an account, and see if that way works. Since website and leaderboards (MBP online) accounts are linked and essentially the same thing, this should enable you to make your forum account if it really is just a browser issue. Since you're dual-booting Windows, make sure that your firewall is not blocking the process. When in the login area, also open the console by pressing the tilde key ( ` or ~ ), and then click Debug and Trace, ensuring they are enabled. Then, if the process fails, quit MBP and go to where MBP is located. Retrieve the console.log file and zip, upload it, or if you cannot do that, go to the pastebin website and copy/paste the contents there, and post the link to the paste here when you post.
Can you read my blob of text? Okay. No? Yell at me to clarify, then.
~PM
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