Nothing more then Chrome.
uhm.. that's a program not a process. Trust me there's always more than 1 process running (and yeah I realise processes are technically programs too)
Check the other tab!
Wireless is always a bad idea when gaming since you get worse response times (lag) and more interference (lag/dc).
If it's the same when you have a cable then it could still be your isp.
Do you have problems when downloading stuff?
Something could have gone wrong when you downloaded the client or with one of the patches. You might wanna try redownloading it and reinstalling.
is it just the lightning effect that makes you DC? I mean have you tested this. will priests casting Magnus DC you? grimtooth? players smackinga mob with bapho carded regular weapons?
have you tried lowering effects? turning off fog, lightning map, using simple effects etc?! there's a number of settings in game and also in the setup.
Tried running one of those graphics performance programs that test your card to the limit? they'll use all sorts of effects
if the programs crash on you there might be something wrong with your graphics card (do other 3D games work flawlessly for you?)