You could try checking the permissions. Follow the steps that Microsoft lists:
1) Click Start, and then click My Computer.
2) On the Tools menu, click Folder Options.
3) On the View tab, click Show hidden files and folders.
4) Clear the Hide protected operating system files (Recommended) check box. Click Yes when you are prompted to confirm the change.
5) Clear the Use simple file sharing (Recommended) check box.
6) Click OK.
7) Right-click the System Volume Information folder in the root folder, and then click Properties.
8) Click the Security tab.
9) Click Add, and then type the name of the user to whom you want to give access to the folder. Typically, this is the account with which you are logged on. Click OK, and then click OK.
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I got this info from their page about <a href="http://support.microsoft.com/default.aspx?kbid=309531">access to the "system information folder"</a>, which I wanted to delete. It was copied from another partition, and was useless. However, I strongly urge you to be VERY careful about removing folders or files that are protected in this way. Unless you are really sure it's not needed, I suggest you leave things alone. You could easily destroy your windows installation, or possibly erase your harddisk.