Configuring linux mint

Hello guys,
i have recently installed a linux mint os which brought alot of issues when installing which forced me to actually format my machine before installing it since it kept telling me that it cant install since the disk is in the wrong format so after formating and installing now i want to install windows(windows 7) so that i can have both linux and windows its refusing to install windows. so far i have tried to install windows both windows 7 and xp. so what do i do to be able to install windows or how do i configur linux so that it accepts to run windows. my laptop is a toshiba settelite L455-55975. PLEASE HELP