I would first create a Windows 8.1 install disk. You can download the Creation Tool here. Select the same version you currently are using. See this page and look for the heading
Booting to Recovery Environment with Windows 8/8.1 installation media or Recovery Drive/System Repair Disc
Do a Refresh, not Reset. You will still need to reinstall your programs.
If recovering your data is a priority then download Fatdog64 linux. Fatdog64-701.iso Burn the iso to a DVD or you can create a bootable USB using Rufus. If you have SecureBoot enabled in UEFI disable it. You may need to enable Legacy Boot. If you use a Windows live account to login to the computer, it's possible the data is encrypted and you will not be able to copy to an external drive using Fatdog.
Once you get to the Fatdog desktop you will see your partitions in the left corner labeled sda1...sda2...etc. Your Windows partition may be labeled sda3 but the way Windows does it's partitioning it could be something else. Click once on sda3, the partition will mount and a File Manager will open. If you do not see your Windows files close out the File Manager and try another sda partition. Attach a USB external drive. A USB icon will appear on the desktop. Click once on it and another File Manager will open. Move the Windows of your Windows partition and USB drive until they are side by side. Highlight any files you need by holding Ctrl + left clicking or by windowing around the files/folders. Drag the highlighted files from your Windows File Manager to your USB File Manager. A small dialog window will appear asking if you want to copy or move. Select copy and click the Quiet box. Your files should be copied over.
I am assuming your USB problem is software related. Your mouse and keyboard should work fine using Fatdog.