Laura

Hi. I've got a hp Dv6-6b58sa which I've only had for 3 days. It is loaded with windows 7 home premium. I have been doing a lot of downloads which I think is what caused my problem. I cannot turn on the laptop. It says that I need to reinstall windows by running the installation disc. But, it didn't come with a disc? Does this mean I'm going to have to buy it separately? Thanks.