I am trying to edit site.com site in my org, Through i am system administrator it gives me access level error shown below:
'you do not have the level of access necessary to perform the operation you requested. Please contact the owner of the record or your administrator if access is necessary.'
Any suggestion??
Check the security tips from https://salesforce.stackexchange.com/questions/5598/permission-problem-in-sales-forece and http://boards.developerforce.com/t5/Force-com-Sites-Site-com/page-is-showing-insufficient-privilege/td-p/233797
If you're sure the security of the Site is fine - try to debug the site https://salesforce.stackexchange.com/questions/1149/how-can-i-get-a-debug-log-for-the-sites-guest-user-public-profile (because you might be getting an Apex error that's not being displayed on your VF page).
Did the site used to work or is it new? If it's new I'm betting on permissions (first 2 links), Guest User profile should be examined if he has access to the objects you're using...
Last but not least: there's a bug they've fixed 5 days ago: http://success.salesforce.com/issues_view?id=a1p30000000RivgAAC Maybe you need to use this workaround, maybe you simply can clone the site and it'll work fine...