Need help with disk partitions

Over the weekend I installed a new hard disk drive in my computer because the old one had started making a whining noise. The disk setup & file migration software provided by the manufacturer was less than 100% - corrupting some files and causing problems with Windows and a couple applications. So I reformatted and restored from an ASR backup I had done previously. Now everything works fine, except that the new hard disk consists of a primary boot partition equal in size to the old disk drive and the remaining space unallocated. There is a way to expand the single primary boot partition to take in the unallocated space. I've done it once before, but I forgot how. Can anybody point me in the right direction to figure out how to do it? Thanks.....

I'm using Windows XP SP 2 and NTFS.

The easiest way I know if is if you right click on "My Computer" and choose "Manage" (about the 4th choice down).
In Computer Management, there should be something call Disk Management. This is the area that you can change the letters of drives, sizes of partitions, create new partitions, etc.

Hope this helps!

Thanks, yes, I tried Disk Management, and I don't seem to be able to do what I want from there.

The only other way I know of is to use an XP setup disk and go at it that way.