C:\Users\mechanic\AppData\Local\VirtualStore\Program Files\Altbinz\temp was over 70 Gigs
I don't know if you figured this out or not, but two things occur to me at first glance...
1) VirtualStore is what Windows uses when you have a program set to write to a directory it shouldn't be writing to. In this case, you have it wringing to "c:\program files\altbinz\temp". Programs shouldn't write to the "c:\program files" tree. alt.binz doesn't set itself up that way. Instead, it'd use "c:\users\mechanic\appdata\local\alt.binz\temp".
2) temp is used as the pieces of a file are downloaded. Once all the pieces are present to create a file, the temp files should be deleted. Something is preventing that from happening as per normal. Is it possible your antivirus is blocking deletion attempts to the "c:\program files" tree to protect you?
Just trying to give you some ideas. Perhaps if you move temp to a normally user-writeable directory, the problem will go away.