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.
Yes, no problem. Is the Install process still running, or did you cancel it? If you canceled I have a couple suggestions before re-starting, but do NOT stop it after 4 hours if it appears still to be making progress.