Hey,
I'm an experienced Magento developer, I can fix the 3 issues you have specified i.e
1) Shop emails are going to spam - do your server support SMTP?
2) Removal of a extension link on sign up page
3) Removal of a graphical single line
4) Change to the header graphic size
I estimate to complete within 24 hrs. What's your website url?
Kind Regards,
Anthony