Disk space problems finder versus df -k disk full

I have not been able to use VMWare Fusion because it keeps telling me I don't have enough disk space on my Mac. Finder shows me as having 129 GB of my 1 TB disk available. When I do a df -k in Terminal I get this:

Filesystem 1024-blocks Used Available Capacity iused ifree %iused Mounted on

/dev/disk1s1 976900220 971333920 3753472 100% 1934160 9223372036852841647 0% /

devfs 186 186 0 100% 646 0 100% /dev

/dev/disk1s4 976900220 1048596 3753472 22% 1 9223372036854775806 0% /private/var/vm

map -hosts 0 0 0 100% 0 0 100% /net

map auto_home 0 0 0 100% 0 0 100% /home

/dev/disk1s3 976900220 506832 3753472 12% 15 9223372036854775792 0% /Volumes/Recovery

It appears I have been deleting files, and Finder thinks they are gone, but the disk still appears to be full. Can anyone help me please?