If it's a desktop computer you can buy a Hard Drive USB enclosure which would allow you to plug it into another computer and browse your C: drive.  You can do the same if you have a laptop hard drive but it would be a different adaptor.  A laptop would be a 2.5inch enclosure whereas a desktop computer harddrive would require a 3.5inch enclosure.  Here's a link to a laptop enclosure from amazon:

www.amazon.com/gp/product/B000PKC102