You can easily Create a Partition without changing Window. Follow the below simple steps:
1. Go to start
Search run, and type diskmgmt.msc.
2. In Disk Management
In Disk Management’s Graphical view, right-click an unallocated or free area, and then click New Simple Volume. This starts the New Simple Volume Wizard. (Note: If you need to create unallocated space, see the Tip Easily Shrink a Volume on a Windows 7 Disk for information on how to do this.)
3. Set size in MBs
The Specify Volume Size page specifies the minimum and maximum size for the volume in megabytes and lets you size the volume within these limits. Size the partition in megabytes using the Simple Volume Size field and then click Next.
4. Fill Required Information
Give name for your newly created partition and then set size for this.
5 Format and Finish
Sets the file system type as FAT, FAT32, or NTFS. NTFS is selected by default in most cases. If you create a file system as FAT or FAT32, you can later convert it to NTFS by using the Convert utility. You can’t, however, convert NTFS partitions to FAT or FAT32.
After allocating size, Format the newly created Partition and then a new Partition is READY. :)