How can I slow down the swing speed tried everything on computer ,please help
You can't slow down the swing speed without buying clubs that have a slower swing meter, otherwise this game wouldn't be very challenging would it?
There are clubs with slower swing meters as well as golf balls.
If you look in the attributes of the clubs you there is a club speed indicator. For golf balls any of the GI (Game Improvement) balls will help slow down the meter.
Cheers