avrdude error uploading code

I am trying to get my 3D printer running on ramps 1.4 working. I have uploaded one set of firmware but needed to change a few things but when I uploaded the firmware I keep getting an avrdude error. Not sure what this is but I have tried restarting both the arduino and my computer. I am using repetier for my firmware.
Here is the error message I keep getting:

avrdude: ser_open(): can't open device "\\.\COM3": Access is denied.


avrdude: ser_drain(): read error: The handle is invalid.


avrdude: ser_send(): write error: sorry no info avail
avrdude: stk500_send(): failed to send command to serial port
avrdude: ser_recv(): read error: The handle is invalid.


avrdude: ser_recv(): read error: The handle is invalid.


avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: ser_send(): write error: sorry no info avail
avrdude: stk500_send(): failed to send command to serial port
avrdude: ser_recv(): read error: The handle is invalid.


avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: ser_send(): write error: sorry no info avail
avrdude: stk500_send(): failed to send command to serial port
avrdude: ser_recv(): read error: The handle is invalid.


avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: ser_send(): write error: sorry no info avail
avrdude: stk500_send(): failed to send command to serial port
avrdude: ser_recv(): read error: The handle is invalid.


avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: ser_send(): write error: sorry no info avail
avrdude: stk500_send(): failed to send command to serial port
avrdude: ser_recv(): read error: The handle is invalid.


avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: ser_send(): write error: sorry no info avail
avrdude: stk500_send(): failed to send command to serial port
avrdude: ser_recv(): read error: The handle is invalid.


avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer

"COM3": Access is denied."

something else has com3 open, only one program can access a comport at any one time

or you just don't have access

1) reboot your pc (as windows loves to lock com ports) just to make sure nothing else is holding open the com port.
2) load up device manager
3) plug in your controller
4) check in device manager that the operating system assigned a com port to the device and that there are no errors
5) load up ardunio ide
6) check ardunio is set to correct com port
7) upload

if it doesnt work, right click on ardunio and run as administrator and try again.

Quote
Dust
if it doesnt work, right click on ardunio and run as administrator and try again.

Dammm... It Worked!!! Thanks alot man.. I appreciate it