Eset Nod32 looks for malicious activity as soon as you windows is done loading driver.
A possibility is that you have some malicious software in your start-up
and your anti-virus is checking it to
make sure you are safe.
Another possibility is that nod32 works very slowly if you installed any
conflicting softwares like new
anti-virus or any new anti-spyware
To Remove Splash Screen at the program startup (ESET NOD32 Antivirus and ESET Smart Security)
In ESET NOD32 Antivirus, or ESET Smart
Security, navigate to the Advanced
setup screen, select the branch User
interface and disable the option Show
splash-screen at startup.
To Remove Splash Screen at the program startup (ESET NOD32 only Antivirus)
Open NOD32 Control Center > NOD32
System Tools > NOD32 System Setup >
Setup. In the General tab, tick the
checkbox „Do not display NOD32 splash
screen at startup“.