Can hsv encephalitis occur in immunocompetent people? how to ultimately stop it from happening? im hsv positive through igg blood test (not type specific) and i have no symptom so far?

Positive IgG for HSV means you had a HSV infection, e.g., gingivostomatitis in children, in the past. HSV encephalitis in immunocompetent adult is very rare and is a treatable condition.

HIV-1 carrier (latent infection) is very common and most people are asymptomatic as you are, some may have herpes labialis (cold sores) or oral ulcer (stomatitis). Herpetic encephalitis is not a common complication so you should not lose your sleep with this rare complication which can be treated. However, it can't be prevented. Take care.