MacBookPro intermittent connectivity with AE/Internet alongside XP/Vista

My family has 3 laptops: 1x Dell (XP), 1x Toshiba (Vista) and MacBook Pro (OSX10.5.6) using my home wireless network: Airport Express connected to VirginMedia Router to internet. Only Mac has intermittent problems:
- All 3 laptops individually have no problems connecting to internet;
- All 3 can simultaneously be on the internet streaming online media;
- However, only Mac has intermittent connection problems;
- The XP/Vista laptops connectivity is faultless, unaffected when Mac is first connected to or using the AE/internet;
- If my Mac is already connected to AE/internet, then connecting XP/Vista laptop will interrupt Mac connection;
- Turning the Airport-client off/on sometimes temporarily re-connects, or once in a while Mac auto-connects for a few mins, but reconnection is not maintained for more than a few minutes, whether internet in use or not;
- Mac alone will remain on internet happily indefinitely if neither XP/Vista laptop are connected;
- I have tried fixes suggested in the forums, such as renewing/lengthening DHCP lease, using DHCP and hard IP addresses, different AE wireless frequencies, removing wireless phones, updating Airport software to latest, turning IPv6 off, etc.
- This issue arises even when all 3 laptops are used in same room, less than 10m line-of-sight from AE.
Any ideas how I can force my Mac to stay connected to AE/Internet and not let my XP/Vista family members win the contest of reliable connectivity?
Yours, the embarassed of the family.

Thanks for the first two replies.
1. Norton and AVG antivirus ran last night.   No problems. Spybot also was run.   So I don't think the problem is related to Arun's ideas.
2. I have a MI424WR Verizon router.   The WAN light is on solid green, all the time. The Internet light flashes.
The router is fed by coax.
I dont know what bit torrent is.   Computer 2 is only used for Pogo on line simple stupid gaming (I am whining about wife's activities).   My Computer 1 is only used for ebay and simple web activities.
I tried resetting the router once today...helped nothing.
Just now I could not get connected via shortcuts.   BUT---I can always get on line through Outlook Express. And I got here via an email link.
go figure

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MacBookPro intermittent connectivity with AE/Internet alongside XP/Vista

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