You say you have a password for the admin folder? Is this done by means of .htaccess? If it is, then Try removing that kind of password protection to see if access continues as normal. I tried that once and it interferes with admin panel access as it should normally do.
If you still fear a hack is going on, aside from checking for additional files, see the modified date on existing php-fusion installation files. all files should have more or less the same date, the date of the installation, unless you havent modified any files that is... If a date seems odd to you look into the file and spot any strange looking code.
If you are not a code knowledgeable person, then you will have to manually replace suspected files from your installation. Some hackers modify existing files to cover their traces. Server access logs are another place to look into if your hosting provider has them readily accessible for you.
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