Wireless signal reallllllly weak!

my macbook pro is sitting on my desk connected to the internet wirelessly through a wireless router connected to a p.c upstairs. my signal goes from strong to practically no signal in the blink of an eye. MY laptop doesnt move, how do i fix it so that i have strong connection all the time?

It is very possible that you may have some form of Wi-Fi interference in the immediate area that is preventing you MBP from getting a good clean signal from the upstairs wireless router.
I suggest you perform a simple site survey, using utilities like the following to determine potential areas of interference, and then, try to either eliminate or significantly reduce them where possible:
For Macs:
o KisMAC
o MacStumbler
o iStumbler, or
o IPNetMonitorX
For PCs:
o NetStumbler
o WiFi Hopper
o WiFi Owl
o WiFi Manager

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