Well, seeing as its pretty doubtful that I'll have weapons stashed away, let alone on me, when it all happens, I guess I can't realistically plan on using weaponry or maybe even vehicles for that matter. I wouldn't make it if I fled and melee attacks will do little good considering my physical strength (or rather, lack of).
For these reasons I'd say the best cause of action would be to defeat the zombies with logic, calmly pointing that each zombie likely only receives on average a fairly small quota of human flesh/brain and thus regardless of whatever virus or radiation or whatever zombified them, they don't consume enough to produce the energy they need to move. Any other plot holes and whatnot specific to the attack will also be pointed out and hopefully cause the whole disaster to collapse on itself and be erased from the timeline.
Of course, assuming that this isn't some dream, I haven't just started seeing things/gone insane(r) and that the above didn't work, I'd locate anything that could be used as a decent improvised weapon, retreat to a fairly defendable location and preferably spread the word of the invasion. I mean, if other people who aren't affected yet are alerted they can better prepare themselves and potentially reduce the damage done.