Hard Drive Capacity Issue -- 51 GBs missing btwn utilized and avail space

I have a 200MB internal hard drive.
My SYSTEM PROFILER states:
Capacity=185.99GB (which I understand due to system use, etc)
Available= 26.25 GB (odd)
This available space reading seemed odd as I don't have much data on the HD (transferred files using Migration Assistant from a 80gb, 1.67ghz older G4 laptop).
So I went to the ACTIVITY MONITOR and looked at DISK USAGE at it states:
Space Utilized= 99.14 GB
Space Free= 25.85 GB
With a total of 124.99 GB between the two (the adjacent pie chart total)
MY QUESTION: If I have a HD with a capacity of 185.99 GB, with only 99.14 GB utilized, why is the space free missing 51 GBs? Where did this memory space go?
Note: I have never partitioned the Hard Drive or created any sort of RAM Disk.
Anyone? Please help.

UPDATE BUT STILL NO ANSWER:
Ran DISK UTILITY which fixed some minor errors and how states "Volume Macintosh HD appears to be OK"
But the issue remains - I have a 200GB hard drive but the data at the bottom of this utility reads:
Capacity : 186.0 GB (199,705,673,728 Bytes)
Available : 26.3 GB (28,291,375,104 Bytes)
Used : 98.6 GB (105,916,047,360 Bytes)
Number of Folders: 173,085
Number of Files: 886,070
HOW CAN I ONLY HAVE 26.3GB available when I have only used 98.6GB of 186GB = Should be a 87.4 GB balance available, not 26.3 GB, right????????
What is the deal here? Is this related to MobileMe or iPhone issue maybe?
The hardware start-up test and disk utility test are all clean. Someone? Anyone?
Thanks!

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