If there are no drivers for Ubuntu or any other linux variation, then it's going to be very difficult to get the system to run it as you would have to manually find and test Linux drivers for each individual component with no guarantee of success.
As for Windows 8.1, if that is the original OS that came with the system, then your first order of business when you got the laptop should have been to create a restore disk. If you haven't done so and have not deleted any restore points (formatted your hard drive) on your system, restore your system back to when it was last working and create a restore disk.
If you have deleted/formatted your restore points, your like only option is to get a restore disk (typically at cost) from the laptop...