If your new hard drive is not showing up in Windows, it simply needs to be formatted. Here is how to format your new (or existing) hard drive from Windows Vista, without using any third party software.
Right click on Computer (which can also be found in your Start Menu if you don’t have it on your desktop). Click Manage.
The Computer Management window should open. When it does, select Disk Management from the left hand drop-down menu.
After selecting Disk Management, you should get a list of your hard disks. Right click on the hard drive that you need to format, and click Format. Note: you can also format and partition existing drives here. You can change any partition except the one which Windows is installed on.
In the Format window, give your new hard drive a name and choose the file system. For most purposes, you would want this to be NTFS. A full format is always recommended, meaning the “perform a quick format” box should be unchecked. Leave everything else as it is, and click OK. If you’re formatting an existing drive, all the data on it will be erased.
After it’s done formatting, your new hard drive should appear in “Computer”.