can anyone please help me,after purchasing a Logitech G700S gaming mouse and trying to install it on my iMac and failing i find my desktop background is now black if i go into system preferences and choose Desktop and Screensaver it just quits on me and won't run at all.i am using a 27inch iMac running OSX EL Capitan Version 10.11.2 i would really appreciate any help anyone can give me.
Yours sincerely Mr M L Wainwright.
Yours sincerely Mr M L Wainwright.