WRVS4400N slowing down my 100Mb internet connection

Hi,
I have a Cisco WRVS4400N on the latest firmware and I have just had my Virgin internet connection upgraded to the 100Mb. Once i thought it was upgraded i checked with a broadband speed test and it came back as 15Mb download and 5Mb upload. Before i rang Virgin i thought i'd check with a direct connection from my pc straight to the modem. Ran the speed test and it came back as 100Mb download and 5Mb upload. I thought the best thing to do is restore my settings back to factory and its still the same. Just wondering if anyone can assist?
Thanks
Andy

Hi Simon,
Thanks for helping mate. Definitely not testing over the wireless so I'm running the connection over a Cat5e cable, 1Gb auto negotiated connection from the Virgin modem to the router, then Cat5e through from the router to the pc also 1Gb auto negotiated. No errors over the connection as reported by the router for the WAN port and none for the LAN port. They are the only things connected. I've turned the wireless off so there should be no wireless devices connected, just the pc.
Cheers again
Andy

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