Recover space from Secure Zone

Greetings: I Installed TI8 build 774 started up the secure zone feature, well I had problems right from the start it wouldnt complete the action I tried to uninstall secure zone and,all I got was the blue screen of death with some thing about Kernel and it had to shut my computer down to prevent damage now I cant delete the secure zone and recover the space from my C:\ drive I did a system restore xp pro but that didnt help I dont intend to use this program ever again and Im looking for the procedure to get a refund I had high hopes for this program and I purchased it with a feeling of security but Im afraid this TI 8 is not for me any help regarding the recovery of the hard drive space would be appreciated thank you