Windows 7 does not see full capacity of used 2nd HD

I am running Windows 7. My MB is a Biostar H55.
I added a 2nd previously used Sata Samsung SP1614C 160GB HD that was operating on XP Pro that had at least 120 GB of files on it that I wanted access to.
My problem is when I installed this 2nd drive it was recognized in "My computer" as drive E: but was only showing about 15mb of files that were either empty or unreadable.
When I opened disk management I saw the drive in 3 partitions. 1st was about 5mb in size, 2nd was about 140GB insize both online and active. A third partition was unallocated that was 10mb in size.
When I tried to explore the larger 120GB partition from disk management, it came up in windows explorer as 10mb in size with the same unreadable files I mentioned above. Disk management sees the larger partition but Windows 7 will not display the files I was looking for.
Is there a way to get Windows 7 to recognize the files on this drive that had been operating under XP Pro?
Any help would be wonderful.
I dont have any other devices other than a mouse, key board, Monitor hooked to the desktop.
I did notice that my old Samsung drive has 8 jumper pins that are empty (not jumped). The operating system drive is a newer Sata that has a slot with 4 pins in it that are not used anyway.
Thanks for any help.
John

Have you tried to disconnecting restart then shut down and reconnect the drive again? Sounds like win 7 confusion. I've had this kind of trouble with HDD, SD cards USB thumb drives. Win 7 just seems to have issues recognizing drives. The good news is once win 7 sees it right it tends to stay that way. I'd try and R&R and go from there.

I shut down disconnected, restarted, shut down, reconnected, restart. did it 3 times still same result.
I finally removed it and put it in another XP OS and it works fine, so I know the drive is good. XP saw it right off as a storage drive. I really wanted to get it on my new Windows 7 though.
I put in a support request with Biostar and Windows 7 support forums. Maybe something will come up.
I had a couple of other old drives that I decided to check first on the XP OS and them put them into the Windows 7 and none of them work in the Windows 7 OS last night. I'm now thinking it must be a lost cause.
Thanks for the suggestion.
John

Is the disk showing up as 'foreign?'

If so, right click it and do an import.

No it shows as online and active as one of two primary partitions, but not foreign.
thanks for the idea!
John