Microsoft is to change its Vista operating system so as not to hamper rival search programs. 

The changes will be made to the program that allows Vista users to search their hard drives and are in response to an anti-trust complaint made by Google, which says the program slows down other search products.
Google also claims that users find it difficult to turn off the Vista program.
Microsoft has agreed to make changes ahead of a hearing into the complaint, and should have them available with the first Vista Service Pack.
The software giant has also agreed to give competitors technical information to help overcome the problem.