avrdude: ser_open(): can't open device "\\.\COM3" - And driver issues

Development Tools IDE 1.x
1

I bought my arduino in University, hooked it up and it worked fine. (Everything was installed already)
Came home, installed it, plugged it in and nothing.

In the device manager I had unrecognised usb port(arduino), uninstalling/reinstalling the compiler didn't work, neither did installing "dpinst-amd64" from driver's folder or CDM drivers. I ended up finding a solution on this forum, where you locate the driver manually, I live in europe and my unit is UNO so I chose the Genuino Uno driver, but this error followed after I tried to compile "blink" example.

avrdude: ser_open(): can't open device "\.\COM7": The system cannot find the file specified.
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

I tried manually changing port from device manager, I tried every solution I could find on this forum for this issue and nothing. I only see one COM port, the one assigned in device manager (I have the impression I should be seeing more from other comments with the same issue).
Whenever I plug it in a different usb port I have to locate drivers again, I've tried both genuino and arduino uno.

Thanks in advance.

2

bump

3

Bumping doesn't work that well in this forum LOL

However ...

When you say "uninstalling/reinstalling the compiler" I presume you mean the IDE ?
Which version of the IDE ?

Are you on Windows OS ?
If so what do you see in Device manager ?

Trying to change the port in Device manager is not a simple task unless you just want to "lock" a com port to a set number"

Maybe post a decent picture of the board but more specifically around the area of the USB port. Please dont just use a generic picture from the internet unless you know it is 100% exactly the same as your board.