Running Parity fills up C Drive and in case of smaller disks, speciall SDD-s, it is an issue. One solution is to move blockchain data storage to another drive.
You can create a directory junction using MKLINK.
First rename the folder or copy it to D:\Parity (assuming you wand the data to be in the D: drive. XXXX below refers to you user name).
C:\Users\XXXX\AppData\Local\Parity
Then use mklink:
mklink /J C:\Users\XXXX\AppData\Local\Parity D:\Parity
Then just copy everything into D:\Parity if you already have files in the original (C:\Users\XXXX\AppData\Local\Parity) location.
https://ethereum.stackexchange.com/questions/24854/move-parity-wallet-large-blockchain-files-to-another-drive-windows