If you haven't installed the new windows 10 upgrade then DON'T!!!
I just recently tried to upgrade from 7 to 10 and it was a total disaster. The upgrade resulted in my computer rebooting constantly during start up and finally not booting the OS at all.
Whats worse is that even the repair and restore to previous windows options it offered all failed. Others seem to be having issues as well. Thankfully I backed up my files before hand so I didn't lose anything important.
I did have to pay to have a friend do a clean install of my old OS for me. Everything is back to normal now. That was a stressful few days, but lesson learned!
So try and wait a little longer to take advantage of the free upgrade if you haven't already. If you still plan on trying it out just make sure you back up your files! BACK THAT S#*% UP!! Remember it's a new OS so there are going to be problems. It's an exciting offer but at the moment it might not be worth the grief.