OS X Lion and windows networking..

This is just frustrating.
After installing Lion everything is just fine initially but now after a day i start seeing some oddities.
I have MBP with Lion on it connected via wifi to a router that has a windows & ultimate machine hooked up to it. It also has a USB drive hanging off it the router that is.
I can see the shared usb device and can write to it. The Windows machine is nowhere to be found. I used to see it with snowleopard just fine.
On the lion machine firewall is open when it comes to sharing and filesharing is enabled.
On the options page under filesharing there is a username that is not checked. it's my username. when checking it it asks for username and i give my username and it claims it's wrong.
Any suggestions short of replacing my wife's windows7 machine. On the windows machine the firewall is turned off and the sahre on it has everyone  having full rights on it.
Any suggestions? Going nuts here pulling what little hair i have out.
-M

There are huge risk with creating a 'shared' partition after installing the OS (both).
I don't think your Mac has the RAM and resources to run both with guest Windows OS.
High speed external drive available? ExpressCard or something?
You can add read and write support to Windows for HFS; and NTFS for OS X.
Paragon NTFS. MacDrive HFS for Windows.

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