If you are trying to do this with the touchpad, then to get around it for now, I would suggest connecting a USB mouse. It should allow you to get to a point where you can save what you are doing.
Try the following and see if it fixes it...
1. Go into "Control Panel".
2. Click "Hardware and Sound".
3. Now click "Mouse and Touchpad".
4. Now go to "Additional mouse options".
5. The Mouse Properties window will open. In here click on your device.
6. Make sure your device is set to enabled. If it isn't then click "Enable Device".
7. Exit both that screen and "Control Panel".
It should work now.
Also, you might also want to check for updates to your drivers.