My Toshiba Portege laptop is running slow after windows updates

Hi.

I have a Toshiba Portege laptop ( intel core i5, 8gb RAM, 255 SDD) about 3-4years old. Recently i find the laptop running very slow .. infact sometimes lags .. this is especially after the windows updates … Further Yahoo does not work properly on this … cannot really use Yahoo mails etc as it is very very slow.

The It guy has also formatted the laptop once.. but even then no difference.

Can anyone please help .. to diagnose what’s the problem and what could be the solution.

Thanks.