Windows 7 desktop drops WIFI connection

Hi -
I seem to see a lot of posts with this same problem, but no solution that's relevant to me.  I have a DLink DIR 655 router that has the latest firmware installed (I updated it yesterday). One of the machines on my wireless network is having problems. 
Two Microsoft Surfaces, three Windows phones, and one Canon WIFI printer all work fine, its only a desktop that uses a USB Wireless card that has the problem.  I am currently using a Medialink MWNUSB150N wireless card.  Note, however, that I had
exactly the same problems with a DLink wireless card.
The problem is that the WIFI connection drops frequently.  The systray will indicate that I am connected to the wireless network with internet access.  Then I will notice that web pages are not loading, but it will still show that I am connected
to the WIFI network and the internet.  After a short time, the systray will show that I am connected to the network, but have no internet access.  After some more time it will show that I am not connected, but will usually show that connections
are available.  When I try to reconnect (my SSID shows as available at this point), then I get an error saying no network is available.  At this point, my SSID no longer shows as available.  I've run the troubleshooter probably 100 times over
the course of several months.  It never helps.  Rebooting sometimes helps.  Sometimes it seems like I need to do a voo doo dance to get the connection back.  Following is the result of running netsh wlan show driver.
Any ideas?
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
C:\Users\Dennis>netsh wlan show driver
Interface name: Wireless Network Connection
    Driver                    : 802.11 USB Wireless LAN Card
    Vendor                    : Ralink Technology, Corp.
    Provider                  : Microsoft
    Date                      : 2/26/2009
    Version                   : 3.0.0.61
    INF file                  : C:\Windows\INF\netr28ux.inf
    Files                     : 2 total
                                C:\Windows\system32\DRIVERS\netr28ux.sys
                                C:\Windows\system32\drivers\vwifibus.sys
    Type                      : Native Wi-Fi Driver
    Radio types supported     : 802.11b 802.11g 802.11n
    FIPS 140-2 mode supported : Yes
    Hosted network supported  : Yes
    Authentication and cipher supported in infrastructure mode:
                                Open           
None
                                Open           
WEP-40bit
                                Open           
WEP-104bit
                                Open           
WEP
                                Shared          WEP-40bit
                                Shared          WEP-104bit
                                Shared          WEP
                                WPA-Enterprise  TKIP
                                WPA-Enterprise  CCMP
                                WPA-Personal    TKIP
                                WPA-Personal    CCMP
                                WPA2-Enterprise TKIP
                                WPA2-Enterprise CCMP
                                WPA2-Personal   TKIP
                                WPA2-Personal   CCMP
    Authentication and cipher supported in ad-hoc mode:
                                Open           
None
                                Open           
WEP-40bit
                                Open           
WEP-104bit
                                Open           
WEP
                                WPA2-Personal   CCMP

Thanks Cody! 
Questions: 
Regarding your advice to check the wireless security settings - I don't know exactly what to do.  I went into the router admin page and checked the wireless security - its set to "WPA-Personal". Other than that, I don't know how to tell if
its using TKIP or not.
The next time it fails, I will try your suggestion to remove the network and reconnect.  I can't remember if I tried that at some point, so I'll give it a shot.  I'm waiting for it to fail right now as I tried something yesterday that I think has
a low chance of success, and it hasn't failed yet.  I noticed that the option to "allow Windows to turn off this device to save power" was checked for the wireless adapter, so I unchecked that value.  I only think it has a low chance of
success, since the timing of the shutdowns was pretty random and did not "smell" like a power saving thing, but thus far it hasn't failed.  I'm still within the window of randomness, though.  Sometimes it works for a little over a day and
sometimes it fails after less than 5 minutes, so I'm just keeping my fingers crossed for the moment.
Comments:
Tried using different USB ports, USB 2.0 and USB 3.0, and front panel vs. real panel just in case there was anything weird going on.  No difference.
Updated the driver using the "update driver" button.  Windows believes I have the best driver installed. I did look for other versions, didn't find anything.
Dennis

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