WRT160n v3 has slow connection when multiple users are connected

As of last night my router has been producing slow connectivity when multiple users are connected to it, but it's perfectly fine when only one user is connected.
I am on a laptop myself, but we also have a second laptop and a desktop where the modem and router are set up.
I have upgraded the firmware so that is up to date.
We have Comcast Fiber Optics so my internet speed is normally quite fast even when all of my computers are connected.
Some settings that I have that might help resolve the issue:
I am using DHCP Configuration.
My Channel Width is set to 20 MHz and I am using Channel 11.
The Security Mode is set to WPA Personal. I had it on WPA2 Personal but I read that changing to WPA Personal might help and so far it doesn't seem to have done anything.
I set the Beacon Interval to 50, Fragmentation Threshold to 2304, and RTS Threshold to 2304.
Everything else is set to the default factory configuration.
Just today I received a notice that said "Windows has detected an IP Address Conflict", but ever since I reinstalled the Firmware it hasn't come back. I've rebooted both my laptop and the desktop to confirm it hasn't come back as well.
I consider myself to be computer savy, but I just can't figure out what the problem is as I've tried everything that I could think of including reconfiguring my router and restarting my modem as well. This problem has presented itself in the past before but unfortunately I cannot remember what I did to fix it.

Try using inSSIDer to help you find the best channel.
http://www.metageek.net/products/inssider/
If that doesn't help, you can try disabling WMM.
Edit:  You should use WPA2 AES security for best performance.

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