My friends laptop (a 64-bit Windows 7 Home Premium with 4GB RAM) was running slowly and she asked me to take a look at it. One of the things (besides that the disks had not been defragmented for a long time, and some other things) is that she had ticked the checkbox "Compress this drive to save disk space" on the OS disk.
Since this is one thing that could make the OS run a bit slower I decided to untick the checkbox. After starting the decompression process, Windows estimated that it would take 16 hours to complete. However about 30 minutes later the OS suddenly shut down.
After restarting the machine I noticed that about half of the top-level folders have been decompressed, and half have not. On the root level the "Compress this drive" checkbox is however unticked.
Is there a way to launch the decompression of files through e.g. a command prompt?