I was able to recover the database folder of MySQL server 5.5 of the corrupted operating system (Windows XP) at
C:\\Documents and Settings\\All Users\\Applica
I think MySQL's file management is pretty simple by default. Create a simple new database, and copy the recovered files into the mysql subfolder which is created in response, replacing any created database files. If that doesn't work, create a table in the new database to get a hint of what else might be needed.