Problem with slow wireless connection: Studio 1555, Intel 5100 Card

Hi, as of 2 hours ago my high speed has been stuck at 1 Mbps, much slower then its usual 65+ that I've had over the last 6 days since I got my laptop. I'm thinking I may have received a faulty wireless card, since when I checked my wired desktop downstairs it's still at it's usual 100Mbps, and my sisters Inspiron 1420 has its normal high speed. Now when I restart my wireless adapter (Intel 5100) the speed fluctuates between 4-38 Mbps for about a minute before dropping- and staying at 1 Mbps once again. I checked if there are any computers stealing my wireless connection just in case, and as I thought no one is. (WPA security)

If someone could please help me in any way, it would be greatly appreciated, as this slow speed is VERY agitating.

Additional info: Router is Wireless N and connection is excellent.

 

i noticed that my speeds were pretty bad with the stock dell drivers and that i would disconnect now and then for no apparent reason. i went to intels site and installed their drivers and my speeds have been close to wired speeds.

http://downloadcenter.intel.com/Product_Filter.aspx?ProductID=3062&lang=eng

 

Also try Disabling IPv6.

Properties > Continue > Untick IPv6 > OK