Clean Boot problem

I have a Lenovo R51 Thinkpad with XP Pro installed. I need to do a Clean Boot to determine if a Service or App that auto starts is causing a connection problem for my HP4, connected via LPT1. (MS Tech recommendation) When I disable all of the Services and Apps via MSCONFIG, the system hangs on re-boot with the 'Checking Embedded Security Chip' message displayed. I would like to know; which Lenovo Service has to stay enabled so the system gets through this process and completes the Clean Boot of Windows? (MS Tech is of no help here) Thanks

Are you still able to get into Windows? If not you might try the recovery tools mentioned here:

ThinkVantage® Rescue and Recovery™

http://www.pc.ibm.com/us/think/thinkvantag…uerecovery.html

Here is a fairly detailed description of the ESS:

IBM Embedded Security Subsystem

http://www.pc.ibm.com/us/pdf/educate_2_ess.pdf