Windows 7: Ati radeon x550 driver

Can any1 help me with this driver for windows 7 , or at least for vista x64 , i'm a little bit nubbish with the search on google i found only catalist but didn't found the driver. Thanks

You should be able to use the Vista x64 drivers, the drivers for your card can be found here:

ATI Catalystâ„¢ Legacy Display Driver

The specific download you likely want is the full Catalyst Suite v9.3 (61.1MB).
To install them under Windows 7, you will need to run them under 'Compatibility' mode. To do that, right-click on the installer, select the 'Compatibility' tab and select the Compatibility Mode and select 'Vista SP1'.

Next, select 'Run as Admin' at the bottom with the checkbox.