Garmin nuvi 3590 map updating farce

[robbocop33]

Just spent a rather pleasant 6 hours trying to update maps on my satnav. First problem, Garmin express wouldn't find satnav connected to PC, then it did, sort of? Then warning come up in windows 10 saying there was a problem with the garmin hard drive and did I want to fix it??
So, I've done all this crap in a constant loop all night, other problem came up once there wasn't enough free space on satnav to install new maps!! , this being the maps it doesn't want to install in the first place, no matter what!
Took the huff and formatted the bloody thing, hoping nice clear drive would help, but nope, software, map installs just fail?? Help!