Here are several steps you can take to resolve this issue:
Causes of Error 27300
Before attempting a fresh install, ensure all traces of previous security software are gone. Use the Kavremover Tool : Download and run the official Kaspersky removal tool (kavremover) to purge all hidden files and registry keys. Remove Third-Party Antivirus error 27300 error installing driver klim6sysx64 exclusive
If another process holds an exclusive handle to the file path or the service key, the transaction fails and rolls back, triggering Error 27300. Here are several steps you can take to
Clean Residual Files with Kavremover: Most technical experts recommend using the official Kavremover tool. Boot your computer into Safe Mode. Run kavremover.exe as an Administrator. Clean Residual Files with Kavremover : Most technical
Fix Network Config Registry (Windows 7/8): If you are on an older OS, a registry tweak may be required.