It seems I had someone trying to perform brute-force login attempts on my SQL 2005 server. As a result, the log file has grown to about 55 gigs and sits in C:\Windows\SYSMSI\SSEE\MSSQL.2005\MSSQL\Data.
The file itself is called WSS_Content_0b8dae5814114114b874e35ea7ba795b_log.LDF and appears to be currently used.
I'm unclear on how to clear or truncate this LDF file. Thanks!