serial port already in use

im trying to use my uno as an isp, but when i uploaded the sketch, it said that com7 was already in use. i unplugged it then put it back in, and now the com port option is greyed out.

restart computer? maybe you have another sketch open that has serial monitor open? you didn't give much info.

i tried loading the blink sketch and same thing, but when i restarted, everything showed up right and i was able to load the blink sketch. i was also having several issues with the isp sketch, but now it uploaded no problem. what did u do? XD

im guessing from what you say, that the Arduino IDE was still using the serial port. if you try to upload a sketch and it fails, wait until it gives an error in the Arduino IDE before trying again.

windows issue fix all: Restart!