Sounds like you're telling me to rename the folder, no, using php? Thanks.
No, not using php.
I viewed your site in IE9 and looks pretty normal, unless I am missing something.
It does not restore the data to where it was prior to the update.
What data? can you clarify please?
Also, try clearing cache in your browser before viewing. To clear cache in your browser, press clrl+f5 keys simultaneously. Also, try different computer/different browser.
If the issue persists, try resetting the plugins folder. Sometimes, an apparently inactive plugin can still cause problems (because the hooks remain unless plugins completely removed or some plugins stick around in cached files. So by renaming the folder, you break them and force them inactive). Instuctions for resetting the plugin folder are here: http://codex.wordpress.org/FAQ_Troubleshooting#How_to_deactivate_all_plugins_when_not_able_to_access_the_administrative_menus.3F