said by [blatantly stolen from ineedvistahelp.com :

Right click the Vista Pearl (Start Button) and choose Explore from the fly-up menu

Browse to C:\Program Files

Right click on the MSN Folder and click Properties

Select the Security tab inside the properties window

Click the Advanced button on the Security tab

Select the Owner tab inside the window presented

Click on the Edit button

Click Continue if prompted

Select Administrators from the "Change owner to"; list, check the "Replace owner on subfolders and objects"; checkbox and click OK

Click OK on the alert shown

Click OK one more time

On the Security tab click the Edit button

Click Continue if prompted

On the window presented, click Administrators under the "Group or user names" list and check the Allow checkbox next to Full Control in the "Permissions for Administrators" list

Click OK

Click OK one more time

Right click the MSN folder and choose delete from the drop down menu

Follow through the on screen prompts