https://www.norton.com/cspn360
to download the standalone installer of Norton 360 and then run Norton LIVEUPDATE untill you see No Update Available to receive the latest version of your Norton 360
What is your OS and its version/build? TIA. N360 22.22.1.58 was released quite some time ago.
SA
Maybe, Norton Data Protector is blocking Vivaldi?
https://support.norton.com/sp/en/us/norton-360-deluxe/current/solutions/v130571264
R U Vivaldi.5.4.2753.47.x64.exe?
Is your Vivaldi installed > C:\Users\user\AppData\Local\Vivaldi?
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as test: Vivaldi.5.4.2753.47.x64.exe installed > C:\Users\user\AppData\Local\Vivaldi
Vivaldi launch feels okay, my side.
Caveat: I'm not familiar with Vivaldi