Negative numbers in InnoDB Status (no replies)

There are some negative numbers displayed in the InnoDB Engine Status output.
Anybody has encountered this or know why this happens ?

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BUFFER POOL AND MEMORY
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Total memory allocated 1467883704; in additional pool allocated 26603520
Dictionary memory allocated 7134560
Buffer pool size 79552
Free buffers 0
Database pages 74624
Modified db pages 15997
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages read 12607789, created 151074, written 3737768
-7.21 reads/s, -0.17 creates/s, -1.10 writes/s
Buffer pool hit rate 1000 / 1000
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ROW OPERATIONS
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1 queries inside InnoDB, 0 queries in queue
6 read views open inside InnoDB
Main thread id 7652, state: sleeping
Number of rows inserted 10757341, updated 2461678, deleted 1189294, read 7916897438
-14.00 inserts/s, -5.18 updates/s, -0.00 deletes/s, -14185.96 reads/s

I am using MySQL Version 5.1.51 (64 bit) on Windows Server 2008

I found a similar topic being discussed here, but it has been closed:
http://forums.mysql.com/read.php?22,67566,67566#msg-67566

Thanks
Minto Mohan