Upgraded itunes, now it won't open

Just updated to itunes, can't get it working. My quiktime works fine. We have uninstalled and installed several times. When i click on the icon it sounds like it will open but fails to. No messages pop up either, it just dosen't work. I tried a set of instructions off apple site but this one didn't work either:
1. Open My Computer from the desktop or Start menu.
2. On the Tools menu, click Folder Options.
3. Click the View tab.
4. In the "Advanced settings" pane under "Hidden files and folders" make sure that the "Show hidden files and folders" option is selected.
5. Click OK.
6. Navigate to the following location by either typing it into the address bar, copying and pasting it into the address bar, or clicking through the folder hierarchy listed:
C:\Documents and Settings\All Users\Application Data\Apple Computer\iTunes\SC Info
7. Right-click the SC Info.sidb file shown and on the shortcut menu, click Delete.
8. Restart the computer and open iTunes.
Does anyone have a viable solution, I'm ****** off. Thanks

hmmmm. we'd still better check on the Norton situation.
try using the trusty Lorraine M technique:
Lorraine M: NIS/itunes problem rectified
but if no joy opening that thread, see this post where i've got a copy of the relevant instructions:
http://discussions.apple.com/click.jspa?searchID=-1&messageID=4249351

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I had this and managed to fix it:
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Graeme

Restart your computer,
Refer steps here to delete SC files:
http://support.apple.com/kb/TS2363
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I uninstalled the new itunes and reinstalled my old itunes and everything works fine, except it won't let me use my new ipod with it. But when I try to upgrade again, same problems.
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tt2

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I am so happy I think I might sing. Or not--I will let my songs on iTunes do the singing for me now that I can again!!!!!!!
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Upgraded itunes, now it won't open

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