"A disk on [computer] is in use and could not be ejected."

Yesterday I was doing a few things and needed to connect to my desktop iMac (running Tiger). When I did I was surfing through the applications folder on that computr when I accidentally opened iTunes. It did open, so I quit it. Anyway, then I ejected the disc, but it wouldn't eject. So I just ignored it and did a softyware update that had been nagging me, then after that I shut the computer down but it wouldn't shut down. The menu went and everything but the cursor remained on screen as did the default background, I didn't have time to sit there waiting for it do whatever it was doing so I just held the power button down and forced it to turn off.
Now though, whenever I turn the computer on, it always opens a window immdiatly after loading asking me to enter the password to connect to my iMac. I can just click cancel but a lot of the time I don't want it connected all the time. If I do connect to it at the start, I cannot disconnect from it. If I click on the disk in the Finder window and click Disconnect it just ignores me and if I click on the eject button next to the disk it comes up with the error in the subject line: "A disk on [computer name] could not be ejected because it is in use." Or something along those lines anyway.
Confusingly, if I click cancel to the enter password window that appears at start up, I can use the computer as normal, I can even connect to the iMac normally and disconnect from it.
Any ideas how I can stop it doing this? Does it have something to do with me opening iTunes on the other computer? Thanks.

This has obviously not getting much attention so I posted again and made my question more clear.
http://discussions.apple.com/message.jspa?messageID=7031788#7031788

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"A disk on [computer] is in use and could not be ejected."

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