Windows 7 iTunes error 7

I have got a windows 7 64bit laptop, and i have been experiancing problems with my iTunes. It worked last saturday (28th April) and ever since then i can't open it back up. it asked me to re-install it as it wasnt installed properly.
The error that is coming up is "Error 7 (Windows error 999).
I have tried un-installing iTunes and re-installing it but it still keeps
on coming up with the same error. I have tried this serveral times now and still getting the same message.
I have put the settings on the recommended settings and still nothing has
happened.
What have I done wrong? Is there anything I need to do?
Kathryn

Refer to this article:
iTunes for Windows: "Error 7" message when opening iTunes
http://support.apple.com/kb/TS3074

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Removing and reinstalling iTunes and other software components
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https://discussions.apple.com/thread/3467825
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http://support.apple.com/kb/HT1926
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See iTunes launch errors caused by iAdCore.dll.
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http://support.apple.com/kb/TS1776?viewlocale=en_US
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http://support.apple.com/kb/HT2250?viewlocale=en_US
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http://support.microsoft.com/kb/822798
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