Try following -
Option 1. Run Malware scan
Malware Bytes - https://www.malwarebytes.com/
Option 2. Disable and re-enable Windows PowerShell
Type appwiz.cpl in Windows Start Search box > Click appwiz.cpl > Click Turn Windows features on or off > Scroll down to locate Windows PowerShell 2.0
Uncheck & OK > Reboot your computer > Once again repeat it and check this time > Reboot your computer
Option 3. Run SFC/DISM