Follow the instructions given here: Remove Nvidia
Updating drivers is not always necessary, most of the time an new driver just fixes a minor problem that you might not have, so there is no need to update just because it happens to be newer.
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How to watch iPhone 6s, iPhone 6s Plus launch live: What to expect from Apple's 9 September 2015…
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Synology invite you to their launch event on 16th September 2015. See the unveiling of the new DSM and products live, plus a chance to win a populated NAS! Tickets are free and available now. Click HERE for more details