Convert into JPEG's. FRAPS -though I guess it to be so- must be taking BMP's when you take a screenshot. This is more preferable since Bitmaps are the absolutely the "mirror images" of the pixels shown on the screen, hence needing no compression after capturing the image.
Lead your way to Irfanview.com and download IrfanView. Open the BMP file (if so) in IrfanView then File > Save As... And change the saving format from the dropdown menu box to JPG, maximize the quality from the slider bar in the window on the right that appears right after you choose JPG format. And save your file, voila, you have a much smaller file.
You may try PNG format for a blend of compression/quality as well as a saving format.
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