can't upload my code to my Arduino Uno R3 avrdude: stk500_getsync():

When I try to upload my code to my arduino Uno R3, it always gives me the error (avrdude: stk500_getsync(): not in sync: resp=0x00) my board is connected to COM3 because I don't have COM1, and seems like my drivers are not installed properly, so can anyone send me a link for downloading the drivers? Because I've tried every possible way in the Internet, but nothing worked!

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If only 1 of ten newbies would use the search function - it's boring to keep repeating the same answers again and again ...