[Computer Specifications required to run Secondlife successfully]

I am looking for the Computer Specifications required to run Second life successfully

[Cross Hairs]

I am in viewer 3, My questionabout Cross hairs (Look At) was answered with this.....  UN-Select Develop/Avatar/Show Look At......when I went there there was no check so I need other options to turn off my "look at". Can anyone help me?

the solution ....UN-Select Develop/Avatar/Show Look At....only turns the "look At" off for me , others can still see it , it is others seeing it that I want stopped

[Cross hairs]

I am on Viewer 3 , Can someone tell me how to turn off my "look at " cross hairs?