Try the options given here : Overheating problem in Ubuntu 14.04
If you still experience heating issues and still want to switch to a new os :
Ubuntu uses four main file systems Ext2/Ext3/Ext4 and Btrfs as Ubuntu natives, while on Windows it is FAT32 and NTFS. You cannot install windows on a Ext2/Ext3/Ext4 partition.
Use KDE Partition manager, or any other partition manager to create a new NTFS partition for your windows os.
https://apps.ubuntu.com/cat/applications/oneiric/partitionmanager/
If you wish to remove ubuntu completely :
Boot into windows installation media and click Shift + f10 to open up command prompt.
Execute these commands :
- diskpart
- list disk (to see the disks on you system )
- select disk 0 ( if ubuntu is installed on disk0 )
- clean
NOTE : Using clean will erase your data. if you want to completely format you hard disk, you can use the command > clean all
The deleted disk will now appear as unallocated space in disk partition manager. Now you can install windows by creating a new NTFS partition during windows installation setup.