In Windows Vista, even though you have administrator privileges, the programs you run have “Standard User” permissions, unless they ask you for permission through the User Account Control mechanism - “Windows needs your permission to continue”.

If you are comfortable with command line utilities, a possible option is to run a command line with Administrator rights. Normally, to start a command line, you would click on Start, type cmd and press Enter. This would open a command line window that looks like this:

Opening a command line with Administrator rights is similar. Click on Start, go to Programs -> Accessories, right click on Command Prompt and choose Run as administrator. You’ll be prompted to approve the action, and will then see a window that looks like this (notice the ‘Administrator:’ prefix!):