Welcome to the TH community, PeroQp!
I'd second what @Mr Kagouris suggested and check how the HDD appears in Disk management. Is this your primary booting HDD or is it a secondary drive in your system? Make sure you backup any data that you might have on it somewhere else. Afterwards, try partitioning & formatting it through Disk Management
. Keep in mind that this procedure will erase everything on the HDD.
Give it a try and let us know how it goes!