Decided to install alongside Windows and reboot PC and it loads Grub with no option to boot Win7, just Mint > stops loading at the end of HDD detection. Reboot again and select ACPI workaround, loads fine and autoupdates. Reboot, now see both Win7 and Linux as boot option,select Linux and get Grub menu with only 2 options, Mint generic and Mint generic safe mode, no acpi workaround offered. Both boot options fail with a black screen requiring a hard reset. Boot into Windows and uninstall Mint. Done! 