I was just working on a Wordpress site and after updating a plug-in (which had not yet been activated, only installed) I activated it. Instead of the activation working, it gave me this error:

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> Internal Server Error
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> The server encountered an internal error or misconfiguration and was unable to complete >your request.
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> Please contact the server administrator, webmaster@ibsmithmedia.com and inform them of >the time the error occurred, and anything you might have done that may have caused the >error.
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> More information about this error may be available in the server error log.
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> Additionally, a 500 Internal Server Error error was encountered while trying to use an >ErrorDocument to handle the request.
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> 
> 

I am getting this error on every page of my wordpress site, not just the plugin page or my user admin area.

How can I fix this? Is there a way to undo this plugin activation (I'm pretty sure it's what's causing the issue).

I don't have access to the actual FTP files of the site, I'm working on it for a friend. But I can get access if that's the only way to fix this. Thanks!