Win7 Pro. is installed on a partition of 150GB and so also RSS. Windows update and Windows system recovery are closed from the beginning of the OS installation. And the total file size of all the other software installed is no more than 200MB. The amount of the free space occupied by RSS virtual mode (or something else) is gradually increased up to more than 120 GB, and the computer slows down. RSS is then removed. But the amount of free space occupied is still over 120 GB. Seems no free space has been released. What should I do to recover the free space? Thanks.