In some cases when drivers are downloaded from the web, they are tagged as “Downloaded Files” in their File Streams and warnings appear on startup. This can be cleared by using the SysInternals Streams utility.
It is very simple to use, run it against the root directory of where the drivers are stored and let it recurse and delete all of the streams “-s –d”.
Download URL: http://technet.microsoft.com/en-us/sysinternals/bb897440