TrueCrypt Registry Start Value not getting set to 1

Hi,

I am using TrueCrypt 7.1a on Window 7. I have done a windows partition encryption. Our client that uses a Cisco Anyconnect VPN requires that we use an encryption software, TrueCrypt is one option.

They require that the registry key be set like this way
TrueCrypt
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\truecrypt\Start,=,1

But I have it like this way when I encrypt either the full disk or the windows partition
TrueCrypt
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\truecrypt\Start,=,0

1. How do I get the Registry Key's start value to be set as 1
2. What is the difference between Start=0 and 1
3. I have tried editing the and setting it to 1 but when I reboot the preboot authentication does not appear.

When I see their log file it shows like this way

[...prelogin_test] test fail (reg_check_dword) (HKEY...\CurrentControlSet\services\truecrypt\Start,=,1,)

How should I get this work.

Thanks in advance

Adrian