Can't use command+tab, exposé, dashboard. Can't turn off!

Hi,
after imported a PowerPoint file from a memory stick formatted on Windows System, the machine wouldn't respond. Once I tried to restart the machine, the iMac freezed on the desktop picture. I mean, it correctly closed all the applications but the machine would not turn off. So I used the power buttom and turned off.
Once restarted and after a few hours of use, i discovered that was impossible to switch to another application from the application i was using, unless pointing over with mouse arrow. All the other commands (command+tab, exposé, dashboard) wouldn't respond either. Then again the Mac wouldn't turn off.
I reboot the machine, did the Verify Disk from the Disk Utility (but not the Verify Disk Permissions, as it never worked?...), but nothing again and after a while I'm getting to the same kind of problem.
I did imported files from every type of systems or machines (hard drives, web, linux, windows systems) and never had a problem like this before.
At this point, I don't really know what to do? Is a problem related to the last version of OS (I have the 10.4.10), to my iMac (PowerPC) or what else?
Thanks

You can access iCloud.com on a computer to turn it off.
http://support.apple.com/kb/PH2702
More >  http://support.apple.com/kb/HT5818

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