Good mornig..i've got an acer aspire 1604lc....i'd like to update drivers...i already tried omega driver but system freeze every time i use a video player...any solution??..thanks...

Sure, use the DriverPacks! 

Seriously though, if you're getting freezes with the omega drivers, your system may be slightly different.  First, ensure you completely uninstall anything "ATI" as well as your omega drivers.
Then, unzip both the Graphics_A & B driverpacks to your hard drive.
Restart your computer and point the 'add hardware wizard' to the D\G\A\5 folder (for drivers).
When finished, double click either the D\G\A\1\ATICCC.exe (for the control center) or the ATICCP.exe (for control panel).  Or install the ATI Tray tool (use google).
Note, the ATICCC requires .NET 2 or higher.