Yeah I see the dissappearing bit.

Really weird.

I also tried to log in / register but IE told me that there were errors on the page

Two things that I would try first.

1. revert back to the classic template for testing purposes.

See what happens when you set things back to the default template. There should be nothing that can go wrong on that template. Just modify your www.youngwaypc.com_config.php file and replace 'youngwaypc' with 'classic' for the template name.

:)

2. I found several times when I was uploading stuff if I was overwriting a file it didn't always overwrite correctly. I found it better to delete the file I had updated from the server and then republish.
So what I am saying here is delete everything, except your database, from the server and republish the lot. It's a long shot but it might help.

Cheers,

DAVE

:)