|You will be best to purchase a new hard drive, and if you did not make a set of recovery disks when you first began using your laptop, you will need to purchase a set from Sony (they will probably need your model number and serial number.|
If you trying to use a USB drive, First you would need to see IF you can set your BIOS to accept booting from a USB drive. Then you would need to use a recovery disk set to INSTALL your operating system on it specifically for THAT computer (IF it lets you). Then you will need to set your BIOS to allow booting from USB AND reset your boot order. IF it works, you will no longer be very portable. DO NOT do this as a temporary measure since Windows cannot be arbitrarily installed on as many hard drives as you like under your license, so an install like this should be considered as a permanent change over. It would be MUCH better to replace the hard drive and use recovery disk set to reset the new hard drive to the same as when the laptop was originally new.
You have to be a little bit crazy to keep you from going insane.
If all else fails, read instructions.