There is a really cool(free) tool that helps you analyze which file and directories are taking up all your space. It's called WinDirStat and you can download it here: http://sourceforge.net/projects/windirstat/
It will help you find where all your space is going and if there are any obscure files laying around (temp files) that no one uses, but are taking Gigs of space.
1: USE DatabaseName
3: BACKUP LOG <DatabaseName> WITH TRUNCATE_ONLY
4: DBCC SHRINKFILE(<TransactionLogName>, 1) --LOGICAL NAME FOUND IN PROPERTIES