Greetings: Bought a new hard drive (Western Digital WD10EZEX)) for Dell Inspiron 546., My unit originally came with a Vista Business O/S which I upgraded to Widows 7 Pro for no apparent reason except when I bought it the Windows 7 O/S was on the verge of hitting the market and I got it free because of the timeline. I have had it since 2009 and recently the hard drive ran into problems, so I bought a new one. My plan is to install the Vista Business to the new hard drive and then upgrade to the Windows 7 Pro. I have both discs to do this. I started with the Vista Business and it went OK until I tried to access the internet and I am stuck there with what appears to be a problem with the Realtek RTL 8101 Network adapter which is "experiencing driver or hardware related issues." I accessed the unit in Device Manager and opted to upgrade the driver but it came back that I have the most updated driver for the device. Now I am stuck and wondering if there is a compatibility issue between the hard drive and the Raltek network adapter. I should add that my computer is hard wired to a D-Link wireless router which is used for our laptop. Thank You.