*Gulp* Formatted the Wrong Thing

[Vampyr]

Okay, a friend of mine formatted the wrong the partition on her computer. She had two and she was redoing her computer because she had a few virus's on her computer. She does this a lot, but this time she accidently reformatted the wrong one. So everything on there is gone. I am an idiot when it comes to computers, so I was wondering if there is anyway possible to get that stuff back.