Restore a Previous Version of my PREZI. Two Computers Logged in at one time.

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Like the title suggests. I have my first try doing Prezi and I was quite impressed with myself. I went home from work and decided to check it out on a bigger screen. Before I knew it I was saving over the last draft of my work computer with the first attempts at importing on the house computer.

It was like watching hours of work disappear in seconds.

Can you restore my last save version? It looks like a Circle Clock with a To Do List in the upper right hand section. I would appreciate the help here. I know I can do it again, I feel like I am in the 90's again and my computer froze before I could save. Except I did save, just the wrong version. My brain is about to explode.

Help if you can, if you can't I will return to my drudgery. My error save happened around 8:20ish mountain time on June 26, 2012.

Thanks.