Can't get back to 300Mbps with my wrt300n v1 router?

Hello All, My wrt300n, v1 router has always worked great, straight out of the box. 
I use various adapter cards and have never had a problem?  All of the cards have connected at their individual full speeds?  Except 1 Airlink 300n that connects at 270mbps?  Still very nice, and what I see most people connect at.   
The main PC on the network has a Dlink adaptor card, and has always connected at a full 300mbps, until now.   I just moved, had my broadband installed just today.  Everything is back up and working except the main PC is only connecting at 130Mbps? 
Here's what I did that may have caused this. I had both homes for 2 weeks; I left my modem and Router in the older house.  So I could use my laptop there if I had to until the new house was hooked up.  Well when I went over to the old house and tried to connect the laptop I couldn't?  I connected to the router but couldn't get to the net?  I thought it might be a router setting, now that the rest of the pcs were not on the network any longer?  So I logged into the router settings and restored factory defaults?  The laptop still had the same problem?   I just disconnected the whole setup, brought it to the new house. 
Cox came today to set up.  They actually used my laptop to connect to the network and test the lines?  It connected as soon as we turned it on and didn't have a problem? However, when I tried to connect my main desktop it only connected at 130Mbps?  Now my network is just called linksys of course because I restored defaults.  Could I have changed anything else that would affect the Mbps on this PC?  I was going to upgrade the firmware a while back just for GP, however I don't think I did after I read here; "if its working don't mess with it"?   As I said though, this PC connected at 300Mbps when I first bought the cards and I don't think I had to do anything to get it to do that?  That was close to 3yrs ago, w/o a problem until now? 
Sorry for the long post but I wanted to explain as fully as possible. 
Does any one have the answers, or even an idea as to what I need to do to get back to where I was?
Thanks in advance for all your efforts.  This Forum and its users ROCK!
Alex   

After you resetted your router you should try adjusting the wireless settings on your router...
Open an Internet Explorer browser page on your wired computer(desktop).In the address bar type - 192.168.1.1
Leave username blank & in password use admin in lower case...
For Wireless Settings, please do the following : -
Click on the Wireless tab
-Here select manual configuratioon...Wireless Network mode should be mixed...
-Provide a unique name in the Wireless Network Name (SSID) box in order to differentiate your network from your neighbours network...
- Set the Radio Band to Wide-40MHz and change the Wide channel to 9 and Standard Channel to 11-2.462GHz...Wireless SSID broadcast should be Enabled and then click on save settings...
Please make a note of Wireless Network Name (SSID) as this is the Network Identifier...
For Wireless Security : -
Click on the Sub tab under Wireless > Wireless Security...
Change the Wireless security mode to WPA, For Encryption, select AES...For Passphrase input your desired WPA Key. For example , MySecretKey , This will serve as your network key whenever you connect to your wireless network. Do NOT give this key to anyone.
NOTE : Passphrase should be more that 8 characters...
Click on Advanced Wireless Settings
Change the Beacon Interval to 75 >>Change the Fragmentation...
Threshold to 2304 Change the RTS Threshold to 2307 >>Click on "Save Settings"...
Now see if you can locate your Wireless Network and attempt to connect...See if you get the desired speed...If not you should un-install and re-install the wireless adapter...

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