Would cutting the router out of the equation have an effect.

Currently the internet comes into the building ... then goes through a wired system to each of the flats ...

It then comes out of the wall as a network cable and goes into a DI-524 DLINK router.

From there it goes again via a network cable to my main PC.

Would it help to take the cable straight from the wall to my PC.

I would then have to introduce a firewall for my PC (prob zonealarm) Does anyone know if this would help?