Windows 7: Cant share folders.

Hi.
Im having an issue where I cant share folders. I have tried to share in every possible way. I have tried to turn on public folder sharing, but it just goes back to off. If I try to share a specific fodler it just says "your folder cant shared". I have tried turning off the firewall without success. ANother thing I have noticed is that I cant access websites that demands cookies, even though my cookies are enabled the website tells to enable them.
I have searched the internet for solutions but nothing have worked.

Try to make another user account. Logon under that account. Same problem?

Same problem. I have also tried to take control over folders, in case that would be the issue, with no luck.