Unable to start boot time scan.

Avast Free Antivirus / Premium Security
1

When I try to do a boot time scan I get a window that says…

Avast Information
Unable to start scar.
The IOCTL call made by the application program is not correct.

Could you let me know what is the problem?
Should I DL an earlier version of the program?

2
  • Which version…?
  • OS…? (32/64 Bit…? - which SP/Build…?)
  • Other security related software installed…?
  • Which AV(s) did you use before Avast…?
3

See if this helps:

Repair Avast:
Control Panel> Program and Features (Add/remove program)>Select Avast> Select Repair. Reboot when completed
https://www.avast.com/faq.php?article=AVKB204