VAP e Secure calling

I am having problems with my computer like (1) frequent disconnection of Wi-Fi even as another computer by the side is working fine (2) Unwanted messages (3) Painfully slow

I ran Norton Scan including Norton Power Eraser etc. with mixed results. What intrigued me is today a guy calls me from VAP e Secure offering to check and repair.

My question is do we need to go for such outfits?  Although I proudly told the guy I have Norton to help me I really do not know if they will and how to get Norton personalized attention?

Thanks for Helping me.