URGENT my website is down- Error 500 internal server error

My website crashed Monday and I basically remade it. The cause of the crash was installing this plugin so I had to delete it from Ipower to be able to log into wordpress to edit it. It was working perfectly fine yesterday, I have made no edits to the site since then. This morning I went to visit our site and I get this message " Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log."

I've looked at my files in ipower and don't see anything different or out of the ordinary. I tried deleted my plugins but nothings helping. I cant log into WordPress either.
Whats happening??
http://www.gosolaire.com