All Wireless devices are incredibly slow lately?

Question

The past couple of days, all of the devices in the house which aren't connected to the router are terribly slow, I'm having trouble with loading videos and things, Videos take about an hour to render 1 minute of the video, if it even renders at all.
2 days ago, it was fine, but now it's terrible. The video has to stop and buffer every 10 seconds or so. Does anyone have any idea what is going on?
EDIT: Just for extra info, Lloading web pages is fine and pretty much instant, but videos are being fairly terrible. I'm just having issues with videos on my Desktop PC and Videos and Podcasts (Listening directly from iTunes, not downloaded) from my iPod.

Answer 1

is your router set like this
Wireless configuration
Wireless connections enabled
Wireless connections enabled Yes Yes
No No
MAC address
00:24:17:f5:43:cf
Wireless network name (SSID)
Wireless network name (SSID)
Wireless interface type
Wireless interface type <script type="text/javascript"></script> 802.11 b/g/n (Recommended)802.11 b/g802.11 b
802.11 b/g/n (Recommended)
802.11 b/g/n (Recommended)
802.11 b/g
802.11 b
Actual data transfer speed
65 Mbps
Channel selection
Channel selection <script type="text/javascript"></script> AutomaticChannel 1Channel 2Channel 3Channel 4Channel 5Channel 6Channel 7Channel 8Channel 9Channel 10Channel 11Channel 12Channel 13
Channel 11