I'm on Vista.
For last several days, at a startup, I've been getting annoying Windows warning:
An unauthorized change has been made to windows
After that, I wasn't able to open Control Panel, get Windows updates, etc.
Validating Windows at Micro$oft site, fails.
I tried System Restore, which to make me more confused, helped for a day, or so, but next time, I start Windows, message is back.
It was driving me nuts.
Search for solution, pointed me to some Vista incompatible program.
The thing was, I really didn't install anything recently, and if even so, System Restore should have helped.
In SAID period of time, all I installed were some Windows updates, so again, System Restore should have helped.
Nothing, no solution.
Finally, I found some POST about PC TOOLS Spyware Doctor, which comes as optional install with PC Tools firewall, may be incompatible.
But, I didn't install Spyware Doctor.
Finally, I've decided to unistall PC Tools firewall (which I've been using WITHOUT a problem for last 3 months), and voila!, problem goes away, Windows validates, no more warning pop-ups.
What happened, I'm not exactly sure. Either some Windows update, all of sudden decided, that PC Tools firewall is non-compatible with Vista (formally, it IS), or PC Tools firewall ran some kind of update (which I didn't notice), and made itself non-compatible.
This is just as a warning to anyone, who could experience similar problem.
All is good now, here. I installed Comodo.
Posted on 18 May 2022, this text provides information on Other related to Reviews and recommendations in Other. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.