Windows 7 Wireless Network resolves Internet IP addresses, but not names

[Andy Thorogood]

Hello, I have an interesting problem that nobody can explain to me....

I have both wired and wireless network cards on my W7 64Bit laptop. When I connect to my router via the wired network everything Internet is fine, no issues no errors. When I connect with my wireless card, W7 reports connection ok with internet access, however DNS does not work. I can ping any IP address on the net and for example browse google by using IP address instead of name, skype works ok too.
Both network cards are set to DHCP and all settings appear to be the same.

I have unistalled (in device manager) the wireless card and deleted the driver. loaded latest broadcom driver for my machine, reinstalled, but still same error. Even disabled firewall in desparation. In the Event log I get the following:

"Name resolution for the name isatap.SE572 timed out after none of the configured DNS servers responded"

SE572 is my Siemens Router, isatap can be other programs also.

My old XP laptop works fine on the wireless along with 4 UMA based mobile phones

Any help or pointers greatly appreciated

Thanks
Andy