Yesterday (10/13/2013) my laptop was infected by a malicious virus and all of my personal files were damaged (they all got set to 0 bytes). Unfortunately, the changes were synced to skydrive and now the damage has spread to 3 of my other machines. I was wondering if there's anyway that the changes made last night could be reverted so I can recover the files.

I'm running Windows 8 on a Core i7 machine.

Thanks very much.