Windows 7 which is touted to be the next linux killer is already in beta form. Some of the board members must have downloaded the beta release and some amongst u must be still using them for day to day activities. Microsoft made the beta release public, so that the public can take a look at its features and the more serious programmers can find bugs/exploits in the release. And many programmers have already found many loopholes in Windows 7 especially the much dreaded UAC.

Here are some tips on how to fix such flaws found in the Windows 7 UAC : Windows 7 UAC flaws and how to fix them - Ars Technica