Trouble registering a car

Good evening all. I'm new here and have a question straight off the bat. I'll make the long story short, but I (stupidly) got myself in debt with the tax man over taxes that I could not pay years ago. I have been to Finanças  and tried to resolve it and was hoping that we could come up with an affordable plan so that I could start settling my debts, but I can not meet even the minimum payment per month. (I work here).

Now, when I went to register a car I've bought, the lady just told me that I have a penhora (seizure) and I can not now register a car in my name. I know that the system is designed to keep some of us at the bottom but this really does seem a bit unfair. Without a car, it's going to be difficult to keep working. I don't want to ask anyone to register my car in their name and I don't want to risk driving the car illegally and getting pushed further down the ladder.

Does anyone have any experience or advice in this matter? I'm really at a loss her, so any help would be greatly appreciated.

Thank you, Daniel.