PSUNMain.exe is a legitimate process, which is a part of the Panda Cloud Antivirus software. It is designed to protect the system. It is not the essential part of the system, so it’s safe to kill it; however, Panda Cloud Antivirus software's work depends on it.
Nevertheless, you could find some people in the Internet that are complaining about this process. The file PSUNMain.exe is considered a safe file. However, modern parasites can name any file anyhow, including this legitimate process name – PSUNMain.exe. If it’s this case, PSUNMain.exe can be malicious. 2-spyware.com research team does not have any information about PSUNMain.exe exploits yet.
If you have problems with this process, if it takes a lot of RAM or CPU, you might be infected with viruses or spyware. In this case, it is best to scan your computer with a reputable anti-spyware software. We recommend using Reimage, it will scan your system and delete every virus or parasite you have there.
If your computer seems sluggish, or you are suffering from unwanted advertisements and redirects to unknown websites, we highly recommend you to scan it with reputable anti-spyware program. Do some FREE scan tests and check the system for unwanted applications that might be responsible for these problems.