To fix CorelDraw X5 install problems (W7 x64) as well as CorelDraw SP3 update problems try this
Open regedit then navigate to:
HKey_Current_User / Software / Microsoft / Windows/ CurrentVersion / Internet Settings / Zones
You will see 5 zones, one with a funny symbol ¬ and 0 to 4 just delete the funny looking zone, roeboot and all is fixed.
That is it.
Onward!