What error do you get??
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run regedit
go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Uninstall and search for any previous itunes installed. if found, delete the root of the folder
then try installing again
or
download latest itunes form
www.apple.com
install winrar.
right click the itunes installation file and drag to any empty folder
click extract
wait till it finish unpacking
when finish go to that folder where u extracted
u will see 6 files
then install according to the following
1. itunes
2. itunesSetupAdmin
3. AppleMobileDeviceSupport
4. AppleSoftwareUpdate
5. QuickTime
6. Bonjour