"Unsealed Door" & "Docter's Secret Plan" on HARD

I'm a HUcast at Lev.51 and I'm havin' problems with "Unsealed Door" & "Docter's Secret Plan" on HARD. I've been tryin' these quests for days and days, but I just can't do them. Can someone help me out?

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I CAN'T GO ONLINE! I've lost my dreamcast internet CD, so I can't make a internet account.

as soon as the monsters run out rush to the door and hide, after they've resumed their stance run in shoot a few times run out run in shoot a few times repeat until all are dead