Need Help on DVD Decrypter and I/O Error

Help!This is the error that i get when i am trying to rip onto hd, the program worked fine before in conjunction with DvDShrink, but now it wont work on any disc decryption. CAn Somebody please help me with problem?
I 00:13:07 DVD Decrypter Version started!
I 00:13:07 Microsoft Windows XP Professional (5.1, Build 2600 : Service Pack 2)
W 00:13:07 Drive C:\ (FAT32) does not support single files > 4 GB
I 00:13:07 Initialising SPTI…
I 00:13:07 Searching for SCSI / ATAPI devices…
I 00:13:10 Found 1 CD-RW and 1 DVD-RAM/±RW!
E 01:06:18 [1:0:0] MATSHITA DVD-RAM SW-9585 B100 (D:) (ATA) - UDF File System Parsing Failed!
E 01:06:18 Reason: Function ‘UDFFindPartition’ returned 0