Since Avast Home Edition 4.7.1043 updated to the latest VPS 000755-0, Windows Security Center keeps telling that the antivirus might be out of date. This is quite annoying, because I don’t know if it’s a windows problem or an avast problem.
According to your information, avast is out of date.
Or you may have made a typo in the VPS you entered 755-0 perhaps you meant 775-0 ?
If so, check your system date, especially the day, month, year and correct as required.