livesystem.exe is known to be part of a process called Iomega Automatic Backup, and these have been confirmed as safe.

Viruses and malware can infect your PC very easily, even if you only surf the internet. The fact that this file is not malware doesn't mean your PC is not infected.

The best way to avoid problems with viruses and other types of viruses is to scan your PC for free and get rid of all the harmful files right now.