In the English version of Windows 7
Control Panel - Systems and Security - Administative Tools - Create and Format Hard Disk Partition
A pictorial view of your partitions is displayed
Right click the partition to resize and select Shrink Volume
Team T-FORCE VULCAN Z 16GB (2 x 8GB) 288-Pin PC RAM DDR4 3200 (PC4 25600) Intel
$35.99
A-Tech 8GB DDR3 1600 PC3-12800 Laptop SODIMM 204-Pin Memory RAM PC3L DDR3L 1x 8G
$13.99
HyperX FURY RAM DDR4 16GB 8GB 32GB 4GB 3200 2666 2400 2133 Desktop Memory DIMM
$14.85
A-Tech 8GB PC3-12800 Desktop DDR3 1600 MHz Non ECC 240-Pin DIMM Memory RAM 1x 8G
$13.99
Crucial Pro 64GB (2 x 32GB) PC4-25600 DDR4-3200 Memory - CP2K32G4DFRA32A
$90.00
A-Tech 16GB 2 x 8GB PC3-12800 Laptop SODIMM DDR3 1600 Memory RAM PC3L 16G DDR3L
$27.98
G.SKILL Trident Z RGB 16GB 2x 8GB 3200MHz DDR4 Desktop RAM F4-3200C16S-8GTZR
$38.99
Crucial 16GB (2x 8GB) Kit DDR3 1600MHz PC3-12800 UDIMM Desktop 240-Pin CL11 RAM
$21.95
Corsair Vengeance 32GB 16GB 8GB DDR3 1600MHz 1866MHz 2133MHz 2400MHz Memory LOT
$79.99