yea thats easy
go to the properties of my computer, ie system properties
then click on the advanced tab
then on settings of 'startup and recovery section'
this opens a windows. at the top select the opperating system you want to use and either unselect the time interval for the boot underneth that from 30seconds or just make it 1 or 2 seconds this will then boot the pc in this default operating system even if it is after a second of waiting.
this should work otherwise click on the edit button and delect the line with the repair module in and it simply wont appear and wont be an option so windowns should boot normally
thanks