Title...cannot boot to my sata hard drive in removeable encloser

Hello,
my desktop crashed and i needed to access the intenal sata hard drive using my laptop. I put the sata hard disk in a usb encloser and connected it to my laptop. i could see all my files in the hard disk but each time i try to boot to it i keep having an errror saying ''bad PBR sig ..... Media failure check data connector''. I think the data connector is ok bcos i can see the files inside but i just cannot boot to it. Pls can anyone help