hello,I have dell optiplex 740.My Ethernet connect worked well until recently i installed a video card..i have tried re installing my windows from windows xp to windows 8 am still not getting no internet. when i try connecting that same Ethernet cable into me laptop i get internet but on the desktop i dont. when it plug it into the desktop the lights comes on...when i go into device management i can see network adapter but there is only a TAP-*** adapter (tunngle) but no Ethernet adapter.. can i please get some help :(:(:(:(:(
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