I agree there's definitely something wrong with these numbers. So click Start -> Control Panel -> Computer Management -> Disk Management. Now look at the partitions and report back what you see there.
Basically my "D" drive is saying i only have 13gb left of 150gb... I did a search using treesize which said I am only using 16gb... therefore don;t understand why im missing 134gb..
Any ideas what it could be or how I can sort this..?