Satellite T110-11U - WiFi works only in one room

Wifi on my LP used to work perfectly in each room of the house, but since I've installed Norton Antivirus it only works in my bedroom (where the router is) and nowhere else.
However, other laptops work ok in the other rooms. I thought is was because of Norton Antivirus and I reinstalled it, but this didn't help. It's already 3 months since then and my LP only gets the signal in my bedroom. So it's got a problem of getting signal even in about 3 meter distance. I've already checked the wireless router with the supplier and there is no problem with it. The problem is in my laptop. I updated drivers but no luck. I've got Toshiba Satellite T110-11U, Windows 7 Home Premium.
If anyone can give me any advice regarding this would be highly appreciated!

Hi buddy,
Maybe there are still some registry keys of Norton Antivirus stored in Windows registry I would try a registry cleaner like CCleaner. This is really nice freeware tool to clean the registry.
What WLAN card driver is installed at the moment? Newest WLAN drivers can be downloaded here:
http://aps2.toshiba-tro.de/wlan/

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