Vista's legal fine print includes extensive provisions granting Microsoft the right to regularly check the legitimacy of the software and holds the prospect of deleting certain programs without the user's knowledge...

Vista also incorporates Windows Defender, a security program that actively scans computers for "spyware, adware, and other potentially unwanted software". The agreement does not define any of these terms, leaving it to Microsoft to determine what constitutes unwanted software... even though that may result in other software ceasing to work or mistakenly result in the removal of software that is not unwanted...

For those users frustrated by the software's limitations, Microsoft cautions that "you may not work around any technical limitations in the software"...