Arduino Uno with Windows 8

hello have problems arduino uno on windows 8.1 pro . followed steps cant upload blink . watched tons of tutorials on how fix nothing works . error message


sketch uses 1,030 bytes (3%) of program storage space. maximum 32,256 bytes.
global variables use 9 bytes (0%) of dynamic memory, leaving 2,039 bytes local variables. maximum 2,048 bytes.
avrdude: ser_open(): can't open device "\\.\com5": system cannot find file specified.

tried other com doesnt work either . if can explain me situation

thx

this other error message when change com
sketch uses 1,030 bytes (3%) of program storage space. maximum 32,256 bytes.
global variables use 9 bytes (0%) of dynamic memory, leaving 2,039 bytes local variables. maximum 2,048 bytes.
avrdude: stk500_recv(): programmer not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x2e
avrdude: stk500_recv(): programmer not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x2e
avrdude: stk500_recv(): programmer not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x2e
avrdude: stk500_recv(): programmer not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x2e
avrdude: stk500_recv(): programmer not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x2e
avrdude: stk500_recv(): programmer not responding
problem uploading board.  see http://www.arduino.cc/en/guide/troubleshooting#upload suggestions.
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x2e
avrdude: stk500_recv(): programmer not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x2e
avrdude: stk500_recv(): programmer not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x2e
avrdude: stk500_recv(): programmer not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x2e
avrdude: stk500_recv(): programmer not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x2e

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