After receiving this message on two torrents, I hoovered my hard drive and cleared over 80GB of space. Using shift-delete to bypass the recycle bin. Now with plenty of space available, I still get the same error message. How can I tell Tixati that there is now more space and to use it?

Tixati 1.96
Windows 7 Ultimate 64-bit SP1

got the same problem, you  have been waiting 3 years for an answer.

the OP was running a very old version of tixati and his problem was probably fixed by updating to the newest version.