Jen - yes there is software available to change the sizes of the partitions, but I don't believe it can be done while there is data on either drive that you want to keep. Changing the partitions typically wipes all data off the effected drives.

If your C drive is nearing capacity there should be plenty of things you can move to your D drive that won't affect the way your programs run. The best things to move are digital images, scrap supplies, mp3s, documents, any of the stuff you typically keep on your desktop or in My Documents can typically all go to your D drive without messing anything up

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