I know this has been posted before but I've tried the suggestions and it is not helping. I had kaspersky Internet Security 2015 and used the standard Windows uninstall process to uninstall it and now I can't install bitdefender Internet Security 2016.
I've done the following:
1. run the kaspersky uninstallation tool kavremvr.exe (uninstalling both Internet Security 2014 and 2015) then run The_New_Bitdefender_UninstallTool.exe and then tried reinstalling but with no luck.
2. done everything I can in ccleaner.
3. cleared out all event logs
4. removed all references to Kaspersky in the registry, although when it starts to search for 10 minutes, it crashes (I presume it found nothing by that stage).
5. checked the devices and there is nothing relating to Kaspersky (even when showing hidden devices).
6. found one kaspersky file which is a windows event log file and I can't delete it as I get the error, that it is in use by Windows audio - this is a common issue, and I can't get around it, but I can't imagine that an event log is going to cause a problem.