Xen Full Virtualization Intel E8400 No Luck Opensuse 11.1

I am attempting to run windows xp in full virtualzation mode on a Dell Optiplex 755 that contains a Intel Core 2 Duo E8400 and i’ve turned on the VT mode in BIOS. When I attempt to run xen. I get this error message

*Error: HVM guest support is unavailable: is VT/AMD-V supported by your CPU and enabled in your BIOS?

I’ve noticed this error message in “xm desg”

*(XEN) Detected 2992.167 MHz processor.
(XEN) CPU0: VMXON failed: perhaps because of TXT settings in your BIOS configuration?
(XEN) → Disable TXT in your BIOS unless using a secure bootloader.
(XEN) VMX: failed to initialise.
(XEN) CPU0: Intel(R) Core™2 Duo CPU E8400 @ 3.00GHz stepping 0a
(XEN) Booting processor 1/1 eip 8c000
(XEN) CPU1: Intel(R) Core™2 Duo CPU E8400 @ 3.00GHz stepping 0a
(XEN) Total of 2 processors activated.

According to Intel, my chip has VT capabilities.
Intel® Core™2 Duo Processor E8400 (6M Cache, 3.00 GHz, 1333 MHz FSB)

I’m am using xen-3.3.1_18494_03-1.8 on Opensuse 11.1.

Any suggestions?