Macbook pro freezes after login

I have a mid-2010 MacBook Pro 15" with a Core i7 2.66GHz processor. Sometime after upgrading to Lion, I started getting the spinning beachball of death just after login. Unlike many posts about freezes on similar MacBook Pros, mine is not freezing before login, but after. I start the machine, login, and then if I try to open any application, the beachball appears and I have to do a hard shutdown with the power button. Then if I restart again, it is usually fine. I was able to fix this problem some time ago by deleting a preference file (plist) for one of my apps (I think), but the problem has surfaced again and I cannot remember how to correct this. Anyone having similar problems, please let me know if you've had any luck fixing it. I am running 10.7.3 (in fact, it seems like the problem may have resurfaced just after the update to 10.7.3, but I'm not sure.)
FYI, I have auto graphics switching off and am still experiencing this problem.

Don't worry about the auto graphics switching. Go to "Users & Groups" in system preferences. Then click on login items and removes all of them. I haven't pinned down exactly which one was causing the problem but I suspect it was one associated with my HP printer.  I have verified that Dropbox and Magic Menu from StuffIt are OK to leave in the login items.  Just remove what you have there and add them back in one at time (if you can't live without them) until it starts to give you trouble again. Let me know if this helps.

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