NU 15 interfering with my internet connection

hi, i recenlty purchased NU 15 just awhile ago, and ran it along with the updates. i also installed onto a second computer.

first system installed onto is a laptop running win7 Ult. 64-bit, second is win XP service pack 3.

i cleaned my registry i believe, and the other components of it, however, shortly after doing this on both systems, my internet connection hasn't been what it used to. most sites won't load up completely, most notably sites that are most commonly visited, they partially load, but not completely. and i can't figure out why!! i have a second laptop, and i haven't installed NU15 onto it, and websites work just fine on it. all sites load up properly and completely.

However, my internet connection hasn't started acting up until just 2 days ago. i have tried restoring past registries, but that isn't helpful. i have also thought of doing a system restore. maybe that will help?? but i wanted to find support first, before doing anything further.

i am not very computer literate, so if anyone is able to help, please explain in easy to understand words, ty :)