Runtime Error R6304

I have just opened iTunes and I got a message say that a newer version was available for download. I started the download but then got a message Runtime Error R6304. An application has made an attempt to load the C runtime library incorrectly. Please contact the application's support team for more information. I clock OK and then get a message iTunes was not installed correctlt. Error 7 (Windows error 1114) Please reinstall iTunes. I have now tried five times but keep getting the sam eresults. Anyone help?

Allan