hey guys, Have HP windows 8.1 (64-bit)Laptop that will not boot back up all the way. Went to f2 did hard drive test and test came back hard drive failed. Product name is K7W77UA#ABA Dont know if you can repair hard drives? seen youtubes where thats been done. If there are other things to check or test that might boot the unit up all the way the info would be helpful. I can buy a new hard drive but I would need a disk so I can reinstall windows 8.1 and I don't know where I can buy the disk. any and all help would be great. thanks