After downloading iTunes 7.0.2 its stopped working Help!!

I downloaded the upgrade as usual but then when i went to open iTunes it said i needed to reinstalled iTunes. I did using my cd that came with my ipod nano (which i got this year in march) but it then came up with an error message saying that the Library.itl is newer than the iTunes i had installed. So i followed some advice i found on this site and deleted the file but now it comes up with:
'The instruction at "0x00559e29" referenced memory at "0x00000000". The memory could not be "read"'.
also my quiktime player isn't working either it comes up with:
Runtime Error!
This application has requested the Runtime to terminate in an unusual way. Please contact the application's support team for more information.
i thought i should stop playing around with it and seek professional advice before i do more damge any would much appreciated!!
Thanks

kia ora, Lost.
the QuickTime problem is probably causing the iTunes problem. (iTunes needs a properfully functioning QuickTime in order to work correctly.)
if WAWolf's suggestion doesn't help, let's try swapping out your QuickTime again (taking a few additional explicit precautions).
head into your Add/Remove programs. uninstall QuickTime.
Next, we’ll manually remove any leftover program files and folders.
1. On the Start menu, click My Computer (or double-click My Computer on the Desktop).
2. In My Computer, open Local Disk.
3. Open Program Files.
4. Right-click on the QuickTime folder and click Delete from the shortcut menu.
5. Navigate to C:\Windows\system32\.
6. Remove the files QuickTime.qts and QuicktimeVR.qtx.
7. Restart your computer.
next, we'll get a fresh copy of QuickTime into your PC by doing a repair install of itunes.
switch off antivirus and antispyware applications prior to the repair install.
go into Add/Remove and select itunes. click "Change" and then click "Repair".
if the repair install goes through okay, restart the PC and try launching itunes again. does it launch properly now?

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