damn dude that fucking blows. you could try reaching out to habbo support? be worth a try, also try enabling 2-way authenticator that would be your best bet.
i mean there are tons of decent anti-malware/scanners out there. i hear bit defender is good.
I was hacked when i first started, or say that. i think my password was 123456 lmaooo so i kind of set myself up for that. since then it's good to have a strong pw with caps,symbols,numbers etc.
hope you can get ur shit back man