Q: Microsoft Partition and Boot Camp

Hey everyone! Yesterday I tried to install Windows onto my MacBook Air 128GB (latest edition) using Boot Camp. Boot Camp was running fine, until halfway through partitioning the hard-drive when the computer shut down. When I started up the computer again there was no sign of Windows anywhere. However, when I looked in my computer's storage I only have 77GB available (the amount I selected for the mac OS when partitioning, the rest of the space was for Windows). I read online that this is very easy to remove the partition, and that all you needed to do was to run Boot Camp again and restore the hard-drive. However, when I try this I receive the message that I must have at least 50GB of free space available. I easily have enough space available when including the partition section that I cannot access, but I do not have 50GB of space on the Mac partition side. Does anyone have any advice on how I should fix this problem? Is the only way I can to delete as many things as possible off of the storage on the Mac side? I have already tried this and deleted as much as possible to get to 50GB of free space, including the "other" section. Is this the only way to proceed? If it is does anyone have any advice on how to remove unneeded junk in the "other" section? Thank you so much in advance!