@Flanker - that's good to know aboutthe tweakability of that model.
I remain bigoted as I said earlier, about the virtues of separate wireless access points, and suggest this is a perfect example of what's wrong with them. 802.11n is not yet a standard, and although I've found the Netgear WN802T to be superb, inappropriate siting of the access point can cause slight problems, so one more in favour of separation.
Flanker didn't say whether he/she is using N mode or G mode or whatever?
I'm using a Netgear N-class network card in my favourite laptop with this access point too, and especially seeing as N isn't a standard yet, having the two from the same stable may be quite significant. Since flanker points out that the reliability problems don't hit every device at the same time, disabling and re-enabling your _WNIC_ on your PC should do the trick. (In Windows Vista, the diagnose and repair feature can re-initialise the WNIC and its drivers too.) So that surely ought to be easier than needing to fiddle with the wireless router. Of course check that you have up-to-date firmware in the router and check that your WNIC drivers are up-to-date. It may also be that you're getting interference from neighbours? Do you see other wireless networks listed? (Not always a good test if some out there have SSID broadcast disabled.) Worth switching channels too, to see if you can get away from neighbours. Microwave ovens will kill you if you are using 2.4GHz (ie. 802.11g/b or 2.4GHz n-mode as opposed to the new 5GHz band) on channels 10 or higher. If this applies to you, switch to channel 1 and then if that improves things fine, else try channel 6.