Depending what is wrong with your computer. If your hard drive is bad then no this will not just fix it by you replacing the hard drive.You will need the drivers disk from Toshiba to be able to install it into the computer. If you have virus or if your computer is running funny but your hard drive is work fine (i.e turning on the computer components) then you might want to back up everything and do a system restore. If you have windows 8,8.1 or 10 you can do a full restore on it without any disk. If you have anything else you need to order them for Toshiba if you didn't create them before the issue happened. If you do a system restore and the computer is still acting funny then you need to trouble shoot the issue.