I brought new antivirus for my PC. But I can't Install and run it. Kindly, help me
May be a Virus is available in your PC that won't enable you to install any software.
Run this tool , it will scan for any AV Programs, when it finds McAfee have it uninstall it, also uninstall AVG and Microsoft Security essentials if it finds it, when your done reboot your system and run a new scan with OTL and post a new log please, there won't be a extras log this time so don't knock yourself out trying to find it
Just check if your OS is updated because sometimes AV meant for Windows 10 will not get installed on Windows 8. If there is any other AV already on your system then it can also stop you from installing it.