Where's the rest of my hard drive?

Today I installed Windows 7 from the disk on my old XP OS. This proved to be not what I wanted. I realized It installed Windows 7 but kept my old XP os. I noticed I had two operating systems to choose from. This is nt what I wanted. So I did a little looking around on the web and realized I need to install Windows 7 directly from the start up. So I did this and when I was intially installing I choose to reformat my hard drive. On XP my one hard drive was partitioned\. One part was for the XP OS and the other part was used for music and videos. I reformated the large portion that was for music and videos. Then Windows 7 installed. Everything ran well and I began to add any needed drivers. I went to install Adobe and I realized I only had a 10 gig hard drive not an 80 gig like before.

What happened? How can I get my other 70 gigs or so back? I'm kind of computer savy so any ideas to fix this will probably be understood at some level.

dumb question. how do I open computer managment?

I need some clarification - Is there any data of any kind anywhere on any partition that you wish to save or protect?

If NOT, then you could have deleted all partitons during setup where you selected the target partiton for install.

You MAY be able to resize (extend) the Win7 partition from within 7.

Start
Search
diskmgmt.msc

If the non-Win7 partition is on the RIGHT side, delete it. Then right click the Win7 partition and choose extend. Type in the large number (this will make sense when you see it).

DO NOT DELETE the XP partition if it is labeled SYSTEM. If you do, you will lose your ability to boot.

here it is

I gave the drive a letter and now its recognized. Thanks!