You might have a problem with this new drive, but maybe not. An installation of Win 7 will normally use a Full Format operation on the HDD, and that does take a long time. Last time I did that operation on a 1.5 TB WD Green it took over 3 hours just to do the Full Format without doing any installation of an OS. So if the on-screen progress bars show you continuous progress, it may be that all you need is more patience.