I have tried to uninstall and reload windows but I can't. I have tried everything in other posts and nothing seems to work. Even tried to just clean partition and then reinstall got the grub rescue screen. Even tried to do that didn't work. I have now reinstalled so can you give me step by step instructions on how to do it please.
UPDATE
I have discovered that Windows 8.1 computers do not come with recovery discs. They have the software on a virtual drive on the HDD. When you get the machine you are supposed to do a back up of it on either several DVD's or on a 16GB USB drive. The product code is part of the Bios of the machine. So when you install Ubuntu on a Windows 8 machine you need to partition FIRST! The installer will not do it automatically for you. Something I have found out to my cost as I now have to pay for a recovery disc from Acer. :(