Here's a list of things I'd do:
1) If you don't have your system backed up, do it now. If nothing else, you want to be certain you have your data backed up.
2) Make sure you have the discs needed to restore your system to factory settings as documented in your Toshiba User Guide.
3) Get your antivirus program up to date, then boot to Safe Mode and do a full system scan with it.
4) Install MalwareBytes, get it up to date, and let it scan. When it finishes, tell it to quarantine anything it finds.
5) From an elevated command prompt (i.e. Start, type CMD, right-click CMD.EXE & click Run as Administrator) type sfc /scannow.
Good luck.