I have Windows 8.1 and when I try to install your driver it tells me I need to update my OEM drivers which I think I have.

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See above

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Hi Keith,

Thanks for posting! No problem - we can figure out what drivers need updating, if you can run our debug utility and email the .zip it generates to us at support@plugable.com. Here’s how:
http://plugable.com/support/plugdebug

Also include your Amazon order # in the email – that will allow us to look up which particular product you have. Thanks for your patience while we work to help!

Bernie