Try uninstalling everything first. Uninstall it all through Add/Remove Programs. Then go into the registry and remove any NI Software componenents that may be left behind. They are located under HKEY_CURRENT_USER\Software\National Instruments and HKEY_LOCAL_MACHINE\Software\National Instruments. Now, ALWAYS make sure that you create a registry backup before you remove anything.
If you follow these steps, your computer should be clean of most all of its NI references. Now go back and try doing a custom install of LabVIEW. Make sure that NI-DAQ is selected to install all components on your machine.
J.R. Allen