Hold the phone.
I have had this problem and I have what you need.
Usasma, Wireless connectivity/networking and drivers are all administrator. UAC requires authentication to install or update drivers.
Windows Vista, Windows XP, and Windows 7 all do the same thing. In fact, so does Linux.
Signal strength can be interfered with at any time. Lets say I have five bars of signal strength, so I am going to get 54 MBPS no matter what. Depending on my range, I may get 36 MBPS if I only have four bars. Sometimes three-five bars give you 54 MBPS. What causes signal strength to vary?
-Thickness of walls
-Interferences of other devices. Any type of electronic device can interfere
-Types of lights
-Power supply to router
-Even right angles!
-RangeCapable WORKING solutions
-Change the channel on the router to 1, 6, or 11. Experiment with it. This has the biggest effect on how signals are transferred
-Get the router and wireless card away from phones, microwaves, and other radiative electronics...especially TVs and antennas
-Safely set certain unneeded network connected services to manual and stop them (if you have any of these, these affect data rates):
[Apple Mobile Device]
[Internet Connection Sharing]
[Windows Media Player Network Sharing]
(Access services by Start, in the search box type services.msc)
Other than that, you should have a good connection. This issue happens to all wireless connections. Sometimes the task manager and wireless utilities ignore weak, small changed to the data rate...and some do not.