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1. check the manufacturers web site to see if there is an updated firmware for your adapter. 2. check your wireless router to see if you have to update the firmware ( this is is you are using this adapter on your home network
This is probably not a virus. More likely a driver misconfiguration. Try plugging the dongle only after your computer is turned on and windows has already started. If this does not help, please elaborate on the type of the dongle? is it a wifi network card or a cellular modem?
Please check you LAN settings on your router (DNS) - usually it is 0.0.0.0 (assigned by provider)
Make sure your PC is using DHCP (TCP/IP properties -> Obtain IP Address Automatically & Obtain DNS server address automatically). Try "ipconfig /all" at others computers and compare with your PC (look at gateway & DNS). See if you can ping gateway and then outside address.
p.s. To access your router open Internet Explorer and enter http://192.168.0.1/
If it is not working, check the default gateway address on working computer and use it instead.
To connect to a basic wireless network (WAN) you need to have a 802.11g (or n) network adapter, I would assume that this is located inside the laptop already (99% of new laptops come with a wireless adapter installed). You should not need a dongle.
Is your "dongle" a 3g modem? 3g modems are often rated at speeds which are practically impossible to reach. Your connection speed will vary depending on the weather, the materials your house is made of and how strong the signal is from the base station. You might notice that your upload speed is especially poor, this is normal for 3g modems. That being said, there are a few things you can do to improve the situation. You can try to get the modem near a window with a better signal, you can install a program like FDM (www.freedownloadmanager.org) which makes a huge difference for download speeds on a g3 modem (I get 50kbps downloads without the program, 400kbps downloads with it). If all else fails you can contact T-Mobile and report a problem with the network - again, it worked for me.