Deleting a Large Crashed MyISAM Table
From my experience with MYISAM (I am still trying to find documentation that supports it), it is safe to manually delete all three table files (.MYD, .MYI, .frm) and that's it - the table is dropped.

After doing that on a test table, MySQL could not find it anymore (SELECT * FROM test returned an error saying the table does not exist), and I was able to CREATE TABLE test again, so it seems that nothing remains from the original table.

I would recommend the following:


Delete the three files. 
Try dropping table table again (this will
probably return an error, hopefully 'table does not exist'.


Good luck.