W7 full install (not upgrade) CDs? This board pre-dates W7 release and depends on packaged LAN driver. After installing W7, install Biostar's chipset driver. Also update your BIOS.
I have a 'Biostar A740G M2+ v6.x' mobo that has a 'Realtek RTL8101E' NIC on it. I was using the adapter with a router without any problems in WinXP. But when I upgraded to 7, an important issue occurred. Sometimes -I don't know when I'll face the problem- I get an error saying that ethernet cable is unplugged, so my network connection is lost. Sometimes this happens at Win7 boot up and more frequently after some time of usage. To resolve it without another boot, I change a driver setting for the adapter in the device manager like setting 'Hardware Flow Control' from ON to OFF and with the system reloading the driver I have my connection back.
A Turkish hw blog (here is the translated page: http://translate.google.com.tr/translate?js=y&prev=_t&hl=tr&ie=UTF-8&layout=1&eotf=1&u=http://www.teakolik.com/realtek-rtl8101e-etnernet-karti-windows-7-update-surucu-problemi/&sl=tr&tl=en) advises to return to the previous driver but I updated the driver from the Realtek website quite a few times hoping to resolve the issue completely. So when I revert the driver back the problem remains. The blog also says the default driver recognizes the adapter correctly but the latest one in Windows Update changes the adapter's name causing this problem.
How can I return to the first driver installed with the OS? Have you had a similar problem and how did you solve it? Thank you.