You can buy certain hardware pieces for it. I once heard of it, but don't know the details. Google it I would say.
You can make a local network with your pc and your mac, and retrieve all your data through the network. (if all goes as it should the pc should appear in finder as a network computer, you can then find your way to your wanted files and drag and drop them to the mac).
What I did (my old pc died) was to retrieve the hard drive and put it into an external enclosure. Then I connected it to the mac and transferred the stuff I wanted.
Your mac should be able to read NTFS (probably the way your drive is formatted) and should be able to transfer the files. It could be FAT32, then there should be not problem. When there is a problem reading the drive it could be because the drive is NTFS, I advise you to install software to read NTFS, for example Paragon;NTFS for mac. But you could google for free solutions.
When you get to the drive, there is no window with my document and such. You have to search your way to that (something like; user, *your username on windows*, my documents).
Hope it helps.