Trouble Logging into WordPress

Hi,

I think somethings up with my site. Sometimes I can log in, other days I can’t. Only 5 minutes ago I was logged onto my WordPress dashboard. Now i’m getting the message.

Earlier the message was “Internal Server Error” however I thought it was down to the w3 Total Cache plugin I had installed. I uninstalled it and now I’m getting the following message when I try to log in:

Fatal error: Cannot run code from this file in conjunction with non encoded files in /home/content/97/7464297/html/wp-includes/version.php on line 371

I uninstalled every other plugin and still get the message.

My site is skintnation.com.

Can anyone help?