help with iTunes

i had iTunes and quicktime on my computer earlier before i got my iPodbut i deleted it and i think i did it wrong. now i'm trying to download iTunes and quicktime again but it says i have an older version and i don't know how to get rid of it can anyone help

Go to Start>Run type regedit. Go to HKEY_CURRENT_USER find Apple Computer Inc and delete the string. DO the same under HKEY_LOCAL_MACHINE. Then go to My Computer double click the C: drive>Program Files and find the folders:
Apple Software Update, Itunes and Quicktime and delete them. Restart the computer and download the latest Itunes. Do this only you have tried to uninstall Itunes through Add/Remove Programs in the Control Panel.