Hi Paul,
1) Make sure you're logged in as a 'Local Admin' or installing the product with a 'local admin' account
2) Per SAP Note: 1868305, you need to do:
a) Disable AntiVirus software or
b) Manually cache the deployment units in question, by copying the content of the folders (the folder name in cache has to match the revision attribute in the seed.xml file of a DU):
i. DATA_UNITS\CrystalReports\dunit\tp.microsoft.msxml-4.0-core-32\ to <InstallDir>/InstallData/InstallCache/tp.microsoft.msxml-4.0-core-32/14.0.3.613/
ii. DATA_UNITS\CrystalReports\dunit\tp.microso ft.wse.runtime-3.0-core-32\ to <InstallDir>/InstallData/InstallCache/tp.microsoft.wse.runtime-3.0-core-32/14.0.0.760/
In short, also disable the Antivirus and Firewall when installing. If that doesn't work, see if the manual copy as mentioned above works.
-Abhilash