You will have to find the Windows 7 drivers from the hardware manufacturer website, since Toshiba will not have them most likely on their support site. 8.1 has been causing a lot of issues, so you may be best to just reinstall Windows 8 and stay away from 8.1.
As for email not working, are you using a Metro app for email, or some other program? If a program on the desktop, what program are you using.
If you are going to use 8, download either Classic Desktop, or Stardock Software's Start8 & Metro mix, along with Chrome. When I did run 8.1, my son still does on his computer, it was exclusively desktop mode all the time. Only time I ever went into Metro, was for Personal settings. My son runs the Netflix Metro app in Metromix with no problems. Email is through his gmail account, no third party software.