There is no undo option. It has to be uncompressed manually. But you can prevent the compression operation (by Disk Cleanup) in future. Follow these steps:
Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\VolumeCaches\Compress Old Files
Backup the branch by exporting it to a REG file.
On the Edit menu, click Delete.
When prompted to "Confirm Key Delete," click Yes.
Quit Registry Editor.
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Regards,
Ramesh Srinivasan, Microsoft MVP [Windows XP Shell/User]
Windows® XP Troubleshooting
http://www.winhelponline.com
I used XP's "compress old files" while cleaning out my drive. Any way to
undo that option? Dont want them compressed.
