When I attach my phone to my PC... I get a USB error. The computer is not recognizing my phone. What can I do?
Assuming it is an S4, download the driver from here:
http://www.samsung.com/us/support/owners/product/SCH-I545ZKAVZW
Install it.
Restart your PC.
Now connect your phone to the PC. If it doesn't recognize the device, try a different USB port.
If that doesn't work, try another USB cable.