If Mageia didn't convince you or you can't install it correctly - in short you want get rid of it - that is your right and Mageia also gives you the possibility to uninstall. This is not true for every operating system.
After your data backup, reboot your Mageia installation DVD and select Rescue system, then, Restore Windows boot loader. At the next boot, you will only have Windows, with no option to choose your operating system.
In Windows to recover the space used by Mageia partitions: click on
Start -> Control Panel -> Administrative Tools -> Computer
Management -> Storage -> Disk Management
. You will recognize a
Mageia partition because they are labeled Unknown, and
also by their size and place on the disk. Right click on each of these
partitions and select to free up the
space.
If you are using Windows XP, you can create a new partition and format it (FAT32 or NTFS). It will get a partition letter.
If you have Vista or 7, you have one more possibility, you can extend the existing partition that is at the left of the freed space. There are other partitioning tools that can be used, such as gparted, available for both Windows and Linux. As always, when changing partitions, be very careful to back up anything important to you.