Hi Katie E,
If you go to "My Computer" and browse through your drives and files, are there any files left from before your laptop was reset?
If not, it is a strong indicator that your files are really gone.
You can try the freeware program Recuva
from Piriform, that can retrieve files in some cases (this could be to difficult to do, so maybe you have someone in the family/friends who is good with computers if you don't want to try it yourself).
But because it seems Windows was reinstalled and thus the drive was partially overwritten again, I dont have much hope :-(
About the pedo thing, if cops surprise those creepy people there might not be time for them to delete all their wickedness from the drive. In other cases, their are options to retrieve data from a hard drive after data has been deleted or even after the drive has been formatted. These methods are very expensive though, and in most cases not available to normal consumers.