Low wi fi reception

Sorry if I am wrong here. Please redirect me in that case. Thanks.

OS Version: Microsoft Windows XP Home Edition, Service Pack 3, 32 bit
Processor: Intel(R) Atom(TM) CPU N270 @ 1.60GHz, x86 Family 6 Model 28 Stepping 2
Processor Count: 2
RAM: 1015 Mb
Graphics Card: Mobile Intel(R) 945 Express Chipset Family, 128 Mb
Hard Drives: C: Total - 152616 MB, Free - 110979 MB;
Motherboard: Hewlett-Packard, 1468
Antivirus: avast! Antivirus, Updated: Yes, On-Demand Scanner: Enabled

I am receving a low signal a less that two meters of router, with normal 15-17 MB download. I received the perfect equal amount until a week ago. My son's and daughter's notepads continue receiveing normal, equal than desk direct PC. I have updated LAN driver; disconnect and take off battery pusshing power button for demagnetize notebook. No results. I would very much appreciate some help. Rest of netbook functioning is perfect OK. Kind regards.

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"There are just atmos and gap; the rest is opinion" (Democritus, many centuries before Hume and Kant)