Not a Happy Camper - Please help!

I bought my iMac in October 2007 after living in the Windows world for decades. I had finally had enough of Microsoft's bugs and looked forward to being able to use a computer without having to become a tech support guru myself. Alas, I've got "some issues" that I desperately need your help or opinion on.
My system is a 20" iMac upgraded to 2GB or RAM. I also have a WD 500GB external drive. Everything else is stock.
My issues are as follows:
1) The system sometimes is either slow or applications freeze
2) Time Machine has stopped working again. Even if I try to manually do a backup nothing happens.
3) The system occasionally loses a setting such as asking me to enter my password for email, or when I open up Pages or Word, I get the welcome as if it's never been opened before.
I have reloaded the OS (Leopard - purchased later) twice now, and the system usually seems to work fine until I reload my documents.
The only software currently loaded beyond the OS is iWork and Office Mac 2004. I'm wondering if there could be something in my data that is causing my issues? My data consists mainly of photos, music, and some Excel & Word docs.
I'd be glad to answer & expand on anything so that I can begin to enjoy the Mac world, but for now I'm very cautious. I've already lost two months worth of data when I didn't realize that Time Machine wasn't working properly.
Thanks in advance,
Ashford

1) You might want to start from scratch again but this time do not migrate your files with the migration assistant. Create a new user name and password, install iWork and Office, install all Apple software updates, then transfer your files over one section at a time testing each one to make sure its working properly before transferring anything else.
Run Disk Utility on your system and external drive. Open Applications/Utilities/Disk Utility select your hard drive on the left then under the first aid tab click Repair Disk Permissions. You can also Verify your startup volume and click Repair Disk on your external drive. Make sure that your external is formatted Mac OS Extended(Journaled). If it is not Mac formatted it will not work properly if at all with Time Machine. Repairing the Disk Permissions is something you can do periodically especially after installing Apple updates.
Breakdown your files basically into 4 categories and set them up separately one section at a time: Pictures, Music, Documents, and email. If you need any help with this process let us know.
2) After the initial setup and manual migration of your files, disconnect your external drive and leave it off for the first week or so. This is to make sure everything is running smoothly as is without the external attached. If all works smoothly after the first week then move on to setting up Time Machine with your external drive. This way if it goes downhill at that point you will no where the problem lies. Also depending on how your hard drive is formatted and what you want to do with it I may have suggestions on how to set it up.
3) This is normal if the Application receives a software update from Apple. Go to the Apple Menu in the top left hand corner choose System Preferences/Software Update. Leave the box checked to Check for updates Weekly but un-check Download important updates automatically. This way there are no background tasks running slowing you down or hogging your bandwidth un-knowingly.
George

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    4.Repeat step 3 for each USB controller that is listed under Universal Serial Bus controllers.
    5.Restart the computer. After the computer starts, Windows will automatically scan for hardware changes and reinstall all the USB controllers that you uninstalled.
    6.Check the USB device to see whether it is working.
    Regards,
    Kelvin hsu
    TechNet Community Support

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