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I had recently 100% completed this game, which took some time. However today when I logged on it, my progress had been completely reset. What's the reason for this, and how do I restore my progress?

Userdata should be saved in 
Burnin' Rubber 5 HD\BurninRubber5HD_Data\UserData\
Can you check if the files are still there? There should be 2 Profile.sav & Settings.dat

I went inside the BurninRubber5HD_Data file, but the UserData file is not there

Did you check the UserData folder as well? Was that folder there at all?
The game won't remove that folder  - it will only create it if it is not there . Was this a clean install?

I'm not sure if it was. The UserData folder is nowhere to be found.