My name is Porkape and I am not bright.

I had not had the need to sync in a couple of weeks during which time my sister used my laptop to backup her contacts from her Windows Mobile phone using Active Sync which used Outlook.

Today while I was syncing in iTunes and it asked me that some of my contacts had been modified, should I allow iTunes to change them? Since I had changed a few I clicked Yes/Proceed.

Now all I have is my sisters contacts on my iPhone and in Outlook. How can I get mine back? Is there a backup that might be hiding somewhere on my PC?

Please Help

Thank You