Dude,
I upgraded from KIS2012 to KIS2013, my problem was KIS not starting when rebooting or starting my PC for the first time.
In google type KIS 2013 wont start, from the links find the kav uninstaller and the fix window setup state reg file, download them to your hdd
This is what u do...
Start PC,
Turn off internet (in otherwords disable your network card)
Turn off all your Antivirus/Firewall, Spyware, Adware (Open task manager, end task on the exe's), stop any background processes
Once everything is shut down and you know you dont have anything running in the background
Goto windows unistall remove programs if you have any KIS product uninstall it from there.
It will ask you to reboot, dont reboot, now run the Kav remover, dont reboot, then run/merge the windows state reg file.
Now reboot.
Once pc restarts, keep internet disabled/again in task manager stop everything
Now install Kis2013
Once installed turn on network card and update/activate KIS2013. should work fine.
You now can reboot, after reboot KIS2013 and all your other programs should work fine, you may get alerts stating you have new startup entries which will be KIS2013, accept them.. thanks it all done...
By the way, the best way to install & Uninstall software/programs/games is keep network card off, stop all programs running then install or uninstall product, this is to ensure nothing conflicts with the installation or uninstallation process....