Ubuntu doesn't recognize partitions

I've looked through a billion similar questions but no proposed solutions have worked.

I have a 90 GB Vertex 3 with an existing windows 7 installation.

Steps taken: Shrunk Win 7 partition. This leave two partitions for windows and a 20gb "unallocated" spot.

Started GParted. Does not recognize the drive partitions.

Started Ubuntu disk utility. It recognizes every partition.

Ran with disk utility "check filesystem" on each windows partition. Says that they are not clean.

Try to partition the free space. I'll paste the full text it gave me:
Error creating partition: helper exited with exit code 1: In part_add_partition: device_file=/dev/sda, start=63812141056, size=20971520000, type=0x83
Entering MS-DOS parser (offset=0, size=90028302336)
MSDOS_MAGIC found
looking at part 0 (offset 1048576, size 104857600, type 0x07)
new part entry
looking at part 1 (offset 105906176, size 63706234880, type 0x07)
new part entry
looking at part 2 (offset 63812141056, size 20971520000, type 0x0f)
Entering MS-DOS extended parser (offset=63812141056, size=20971520000)
readfrom = 63812141056
MSDOS_MAGIC found
Exiting MS-DOS extended parser
looking at part 3 (offset 84783661056, size 5241831424, type 0x07)
new part entry
Exiting MS-DOS parser
MSDOS partition table detected
containing partition table scheme = 1
got it
Warning: /dev/sda contains GPT signatures, indicating that it has a GPT table. However, it does not have a valid fake msdos partition table, as it should. Perhaps it was corrupted -- possibly by a program that doesn't understand GPT partition tables. Or perhaps you deleted the GPT table, and are now using an msdos partition table. Is this a GPT partition table?
got disk
Error: gpt disk labels do not support extended partitions.
ped_partition_new() failed

I've also tried a billion things that seem to have no effect (I usually stop before they do anything because they seem to require reformatting the whole drive.)

Does anyone have a solution that allows me to keep my windows 7 install?

Thank you so much

-Jeremy