Hello all, i am having a problem with the internet on all users on my PC 3 users.

I have tried checking for viruses with Avast, a few little problems solved, still slow.
Tried emptying the usual, still slow.

Threatfire found nothing.

I have Avast, threatfire, Spywareblaster, Malwarebytes, Superanti-spyware, Zonealarm, Winpatrol installed.

Can you list for me a few things to try.

Thanks, GEP