Time Machine failing to back up

Hello Apple Community!
I've got a brand new MacBook pro 13" 2.3GHz i5 model. This is my first Mac and I would just like to say I absolutely love them and can never ever see myself going back to Windows ever again
Well I wanted to set up the TimeMachine, so I bought myself a brand new Hitachi 500GB ext HDD to store my BackUp on (it's a USB one, I've seen that firewire ones are suggested but surely it doesn't make any difference?).
However it just wont work. Whenever I run the backup, it runs for about 5 mins and then the message
+*"The backup was not performed because and error occurred while copying files to the backup disk.*+
+*The problem may be temporary. try again later to back up. If the problem persists use Disk Utility to repair your backup disk."*+
Well this message has appeared on each of about 15 attempts I have tried to get it working.
Of course I did what the message said and repaired the disk and left TimeMachine to run it's backups automatically. They ran but the error message continued to occur.
First I thought it might have been because I was running Parallels (there is a warning that appears warning that it may be slower due to backup) so I stopped using that when running it.
Next I figured it could be the format of the drive? But TimeMachine tells you if the disk is wrong.
Could be the size of the volume? I had it partitioned ready for media to go on the other half, so I redid the partitions to make the backup one 400GB (plenty big enough, my MacBook's hard drive is only 320GB)
Still no luck so I removed the partitions completely and reverted the disk to how it was when I purchased it. When I re-setup TimeMachine, it changed the disk format to what it wanted to be (Mac OS X extended (case sensitive, journaled)) - not sure what the difference between each type is, but this was automatically set up. The error occurred again.
I've tried using a different external harddrive and that didn't work either.
So I'm thinking there is probably a setting that I've missed out or it's because I'm using the computer while it's running (hopefully this is not the case).
If I could have any help with this problem that would be excellent.
Thanks in advance
Josh

Actually, Time Machine does not always tell you if its disk is formatted incorrectly. Open the Disk Utility utility (in the utilities folder, which is in the applications folder) and make sure you initialize your Time Machine disk as Mac OS X extended with the GUID option set in the partition table.
If that doesn't help, I suggest you take advantage of your free Applecare warranty and call Apple to ask for assistance in this matter.

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    Then a few minutes later...
    Jun  5 08:14:46 Dwight-DuBoiss-MacBook-Pro [0x0-0x44a44a].backupd-helper[10777]: Not starting Time Machine backup after wake - less than 60 minutes since last backup completed.
    Jun  5 08:15:44 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[10787]: Starting standard backup
    Jun  5 08:15:44 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[10787]: Attempting to mount network destination URL: afp://Dwight%20DuBois@Time%20Capsule._afpovertcp._tcp.local/Data
    Jun  5 08:16:41 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[10787]: NAConnectToServerSync failed with error: 89 for url: afp://Dwight%20DuBois@Time%20Capsule._afpovertcp._tcp.local/Data
    Throughout the day the error has changed to...
    Jun  5 14:47:01 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[11356]: Starting standard backup
    Jun  5 14:47:05 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[11356]: Attempting to mount network destination URL: afp://Dwight%20DuBois@Time%20Capsule._afpovertcp._tcp.local/Data
    Jun  5 14:47:35 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[11356]: NAConnectToServerSync failed with error: 64 for url: afp://Dwight%20DuBois@Time%20Capsule._afpovertcp._tcp.local/Data
    Jun  5 14:48:35 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[11356]: Failed to resolve network service using name = Time Capsule type = _afpovertcp._tcp domain = local.
    Jun  5 14:48:45 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[11356]: Backup failed with error: 18
    Jun  5 19:57:53 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[11396]: Starting standard backup
    Jun  5 19:57:57 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[11396]: Attempting to mount network destination URL: afp://Dwight%20DuBois@Time%20Capsule._afpovertcp._tcp.local/Data
    Jun  5 19:58:53 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[11396]: NAConnectToServerSync failed with error: 89 for url: afp://Dwight%20DuBois@Time%20Capsule._afpovertcp._tcp.local/Data
    Jun  5 19:58:53 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[11396]: Attempting to mount network destination using URL: afp://Dwight%20DuBois@Time%20Capsule._afpovertcp._tcp.local/Data
    Jun  5 19:59:49 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[11396]: NAConnectToServerSync failed with error: 89 for url: afp://Dwight%20DuBois@Time%20Capsule._afpovertcp._tcp.local/Data
    Jun  5 19:59:59 Dwight-DuBoiss-MacBook-Pro com.apple.backupd[11396]: Backup failed with error: 19
    Help?
    (My other computer hasn't backed up for two days.)

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