Freezing during start up - only on admin account

I have two accounts enabled on my Macbook Pro: One main account which is the admin, and one for my boyfriend to use.
A few nights ago I downloaded a pdf file from an email and the computer froze. (the file download could just be a huge coincidence) I restarted and when I try to log in under my Admin account, everything loads, but I can't do anything; The cursor just stays as the spinning wheel as if it's loading, but nothing ever loads.
When I login using the other account everything works fine. What's going on? How can I fix this?
I've tried safe mode but it just does the same thing.

Hello,
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for action in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport in 10.4 & below, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
/Library/LaunchDaemons

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