Iphone not connecting to my laptop , itunes

hi , i have iphone 3gs  , updated with ios4 , 2 days back i was suffering with issue of  "This accessory is not optimized for this iPhone"   and all  sound issues were happening like no sound for songs etc  but now thats all ok , my charger is doing well but now "my iphone is not connecting with my laptop , no itunes"    it is not even getting connected to laptop . only charger is working , why is this happening ,,, friends plz help me out....

See
iOS: Device not recognized in iTunes for Windows
- I would start with
Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP
or               
Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8
However, after your remove the Apple software components also remove the iCloud Control Panel via Windows Programs and Features app in the Window Control Panel. Then reinstall all the Apple software components
- New cable and different USB port
- Run this and see if the results help with determine the cause
iTunes for Windows: Device Sync Tests

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