Once your Vista install is up and seems stable, you may want to reclaim that space but will find you can’t merely delete the folder, even logged in as an administrator. There is a method provided to remove the directory but I didn’t know it until I stumbled upon it.

To remove the files from these old Windows installations, do the following.

1. Click on your Start button.
2. Click on Computer.
3. Right Click on your main hard disk.
4. Select Properties.
5. Click on the Disk Cleanup button.
6. Click on Files of all users in the popup.
7. Click on Continue.
8. Look through the list of file types and check the box next to Previous Windows Installation(s).
9. Click OK to perform the cleanup.

Hope this is helpful.

Like any other person, my response was “What the heck?!?” Well, my response might have been a little more colorful, but you get the idea. After the surprise wore off and the usual suspects had been cleared, I proceeded to hunt around for an answer.

It turns out that one of the ways Vista protects your data and system is to create system restore points – to be able to restore your system to a previously stable state. It also keeps shadowcopies of your documents, in case they become corrupted. Usually Vista installs with a maximum space set (default is 10% of the total disk space, I believe). When this space is exceeded, Vista will begin deleting the oldest restore points and shadow copies to make room for the new ones.

For some reason, on the system this was happening on, the maximum size was set to unbounded. It could use ALL the space.

To clean up the files (but keep the last system restore point), you can perform the following:

1. Click on your Start Button.
2. Click on Computer.
3. Right Click on your main drive.
4. Select Properties.
5. Click on the Disk Cleanup button.
6. Select Files from all users.
7. Click Continue to authorize.
8. Click the More Options tab.
9. Click the Clean Up button under System Restore and Shadow Copies section.
10. Click Delete to confirm.

There is a way to set the size limit of the Shadow Copies yourself but it’s more complex and easier to mess up than is probably appropriate for this blog. You’re welcome to contact me using the Contact Form if you need me to tell you how to do it.