Linux Partition Not Displaying, Inaccessible

I upgraded my system from Windows Vista to Win 7, 32bit professional edition. I had a partition set aside for Linux Ubuntu. Now, I cannot access Linux from the boot menu, as I used to. It is still listed as an option at boot, but highlighting it and hitting return/enter just causes a black screen.

When I go to the disk management tool, the partition isn't displayed (screenshot attached). I have also gone in through command prompt---diskpart----list volume, but that doesn't show it either. I know it is still there, because I have a 120GB hard drive, and if you add up all the partitions that disk manager lists, it is short of 120GB.

I am trying to delete the Linux partition entirely. I have thought about just formatting my HDD and starting over, but I only have the 'upgrade' windows CD and am afraid I won't be able to re-install windows. Any help is much appreciated.

Also, when I launch msconfig and go to the boot menu, the windows partition (C) is the only one shown.

I see where I have 1.34gb of free space, but if I add up everything in the 'capacity' column, shouldn't get something close to 120GB? It only adds up to 110.442GB, and I know my Linux partition was ~10GB.

In the past, when I installed Ubuntu, I burned the files onto a CD from the web, repartitioned my hard drive, and then installed it off the CD into the new partition.

OK. Thanks. That graph is very helpful.