Bitcoin Purchase 2011

I remember a friend telling me about Bitcoin back in 2011 so I got online to find out more information, checked into it, took a while for me to wrap my head around it, and I think I bought some but I really can't remember for sure if I did or not. My question is, how and where would I have had to do that back in 2011? A web site or a platform or exchange of some sort? I still have the computer that I would have used to buy it back then and it works and boots into Windows. Anyone that can provide me any info on the possible "how's and where's" that were available for buying Bitcoin back in 2011 would be very helpful and appreciated. If I'm able to uncover that I actually DID buy some bitcoin back then, and if I'm able to access it, I will make the person that provides me the "how and where" info that ends up in allowing me to find and uncover it, well... let's just say that I will make that person very happy to have helped lead me to the right place.