File size grows when compressing to h.264

I wonder if any of you can help me here. I created a quicktime movie from iPhoto of a slide show. It runs for 3mins is 1024 x 768 pixels with MPEG Layer 3, Stereo, 44.100 kHz and a data rate of 915.78 kbits/sec. The file is 9.9 MB.
I "compressed" it to h.264 as follows:AAC, Stereo (L R), 44.100 kHz
H.264, 720 x 576, Million and a data rate of 717.84 kbits/sec.
The file GREW to 16.5MB.
Any idea on what I am doing wrong.
Dave

Thanks for the input. Yes I looked at the save as option and the file would swell to 20MB saved that way. I had not realized that the Finder was so "economical" with its information.
The movie size was more abritary than anything else, smaller than the original. I have done slides shows in iDVD before.
The reason for trying to go to h.264 was for use on a PC. Whilst quicktime is available under Windows, a lot of people want to use Windows Media Player and mp4 will play in WMP. I used a PC utility to transcode the movie on the PC but ended up with a 37MB file on that occasion.
Is there an efficient way to turn QT movies to WMP AVI's?
Dave

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Life Savers? You give out crummy Life Savers? Grrr - you get
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(If you *MUST* email me, don't LAUGH when you do so!)
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File size grows when compressing to h.264

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