...cannot delete kaspersky registry

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I have been having a problem with Kasperky internet security. I downloaded the application to my system after my avast anti-virus began experiencing problems. I was disappointed with the system when it failed to run due to some malfunction that I cannot pinpoint. The only thing annoying me is that I tried to remove it by using the application removal and by deleting the program’s registry keys. I don’t want any trace so I do the l second procedure. The thing is. I cannot complete delete the kaspersky because I need permission from the system to do so. The same goes for its related keys in the registry. How do I do this? I am now using a different antivirus because of the failure of the two aforementioned programs. I am using free anti-virus versions. In addition, how do I manually choose my anti-virus software for my PC’s protection.