Slow pings to router

i have 2 computers, a laptop & a desktop (PC). They both connect to a
netgear wireless router - the laptop, without any problems.

The PC was fine for about 2 years. However, it recently had a netgear
wireless card die - loads of BSODs, etc. So, i replaced the wireless
card with a Linksys card. Worked OK, solved the problem and gave a
stable connection for a while.

Now though, i have problems connecting to the wireless router from the
PC. can still connect fine from the laptop, so i don't think there are
any hardware issues with the router, etc. I changed the channel of the
router from 6 to 11 - and it has improved the performance somewhat (i
can now at least connect from the PC) - but i am still suffering very
slow pings to the router.

Laptop pings (from the same room) sit at around 3ms
However, the PC pings can fluctuate to over 2000ms, but usually sit
around 300ms...

Does anyone have any suggestions for a cause (and solution) to the
problem?

Help is appreciated!

BTW - i have tried a firmware upgrade, but it seems as if i'm on the
latest...

thanks


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