Samsung C3060R driver fo Windows 7
uninstall again your pc studio, restart you laptop and reinstall your pc suite, but before you do install it, try to do this trick, right click the pc studio, select properties, then select run in compatability mode of xp and vista, then select run as administrator, select apply and ok. it will install, there are times that windows 7 will inform you that the program not installed, you will be having two options, select, '' install the program with recommended settings''.
once installed, connect your phone to your laptop, select settings on you pc suite, select connections, select usb, this will command the pc suite to search for phones attached to usb ports. once searched, it will install your phone automatically and will look for appropriate device drivers for your phone through your pc suite, once connected you are set.
if this doesn't fix your problem, try updating you device through device manager, direct your device installation by browsing the folder to your samsung pc suite and unchecking the automatically install the best driver and checking the box for include the drivers on this folder.