Daemon Tools Lite
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Full user review
"Better than SlySoft"
SlySoft Virtual Clone Manager will not work on Vista, but this acts like it's part of the computer upon purchase. I didn't even have to restart after installation. So easy, I can't believe I wasted my time trying to make the other one work.
Have not found any cons.
Don't waste your time with the one with the sheep in the logo. It won't work for a computer older than 1 year.