WRT54GL having network stability issues in Windows 7

Hi!
I'm currently evaluating moving to Windows 7 Bits (currently running Windows 7 Ultimate 64-bit from MSDN) on a stationary test computer (AMD X3, 8 GB ram, etc...).
I've got 2 Ubuntu 64-bit machines on an gigabit LAN, and an Tvix media player running fine all attached to a D-Link DGS-1005D gigabitswitch that is attached to a Linksys WRT54GL v1.1 router with a 10/10 Mbit internet WAN. I am NOT using any wireless connection other than very seldom for an iPhone or when installing/supporting/servicing other peoples laptops.
My test computer is running Ubuntu 9.10 64-bit with excellent performance but booting to windows 7 ultimate gives me strange network problems. I first tried the built in gigabit lan on this computer but then tried changing into using a D-Link DGE-528T gigabit lan controller (gives better performance when the network is actually up). I have also tried windows xp 32-bits which worked perfectly..
Back to windows 7...
The funny animated new network diagnostics center seems to always pinpoint that it is my router that isn't working although all my other computers are running fine at the same time. I'm am at this point unable to access http-admin for the router from the w7 computer (fully accessible from linux though). Scanning through the web I've tryed a feew tips with no final solution:
* Disabling IP6 protocol (less problems after that)
* Limiting the network load for my primary linuxserver (might actually have also lessened the problems).
* Tried with and without QoS on the WRT54GL router.
* Tried disabling the QoS service on the network card in Windows 7.
* Tried a few pointers from: http://speedguide.net/read_articles.php?id=2574
* According to my reading, this one was the primary candidate for fixing my problem: netsh int tcp set global autotuninglevel=disabled
* I've upgrade my Tomato firmware to v1.25.
If I simply wait long enough the network problems seems to disapear by it self. But then at a non repeatable time pattern the internet connection via the router is lost again.
I've not tried DD-WRT and some people have suggested that it would solve the problem but no one has pinpointed exactly what in the DD-WRT firmware solves this.
I'm currently laughing about the suggestion from the windows 7 suggestion to look after a router with a sticker saying "Compatible with Windows 7".
Anyone got any pointers on this? I'm afraid I need at least one windows, preferably one supporting 64-bits due to my memory needs and I simply love my LINKSYS WRT54GL since it is the only router I have ever owned that NEVER has failed (and therefore is the only one I'm recommending to other people also needing 24/7 remote access capability from outside their own network).
Best regards
Thomas

Tnx for quick reply!
I've tried disabling the anti-virus (AVAST) and also disabled the windows 7 firewall (actually disabled the built in software firewall before - forgott it in the list above!).
I've also today tried both letting my WRT54GL assign a static IP (192.168.1.110) and normal DHCP (192.168.1.103). Both seems to work but the network is stil lost at random intervall that seems to happen more often if my network load through the router is higher.
When Win7 thinks the network is down it is not possible to ping the router (192.168.1.1) from win 7 but my linux computer has no problems doing that (and happily keeps using the net).
Strange this...

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