I came across this and thought it may be usefull to a few people here on the forums, although if you use 16 bit applications you may want to keep this disabled:
This security hole is said to affect 32bit Windows operating systems
And the removal instructions. Enabling the "Prevent access to 16-bit applications"
A CRITICAL FLAW has been found in the Windows NT trap handler that makes all Windows machines wide open to hackers. The problem has been a feature of every Windows system for the last 17 years and no one has noticed. According to Full Disclosure, the security hole in Windows allows users with restricted access to escalate their privileges to system level. It can be done on all 32-bit versions of Windows from Windows NT 3.1 to Windows 7. This is not likely to bother consumers much, but corporate IT managers will be wetting themselves.
2. Run (Windows key + R)
3. Type gpedit.msc and press enter (Run as Administrator if need be)
4. Expand - Computer Configuration
5. Expand - Administrative Templates
6. Expand - Windows Components
7. Open - Application Compatibility section.
8. Double Click 'Prevent access to 16 bit applications'
9. Check Enabled
10 Click Apply then Ok
Here is a screenshot to help those having any troubles: http://i24.photobucket.com/albums/c11/smak...6bitdisable.jpg
Edited by jackbrennan, 11 March 2010 - 03:36 PM.