Information about your computer's attempt to join a domain is logged in the Network Setup log, %SystemRoot%\Debug\NetSetup.LOG.

Here is an excerpt:

                              05/03 20:34:10 -----------------------------------------------------------------                              05/03 20:34:10 NetpDoDomainJoin                              05/03 20:34:10 NetpMachineValidToJoin: 'JSI009'                              05/03 20:34:10 NetpGetLsaPrimaryDomain: status: 0x0                              05/03 20:34:10 NetpMachineValidToJoin: status: 0x0                              05/03 20:34:10 NetpJoinDomain                              05/03 20:34:10 	Machine: JSI009                              05/03 20:34:10 	Domain: JSIINC.COM                              05/03 20:34:10 	MachineAccountOU: (NULL)                              05/03 20:34:10 	Account: JSIINC.COM\Jerry                              05/03 20:34:10 	Options: 0x25                              05/03 20:34:10 	OS Version: 5.1                              05/03 20:34:10 	Build number: 2600                              05/03 20:34:10 	ServicePack: Service Pack 1                              05/03 20:34:10 NetpValidateName: checking to see if 'JSIINC.COM' is valid as type 3 name                              05/03 20:34:10 NetpCheckDomainNameIsValid \[ Exists \] for 'JSIINC.COM' returned 0x0                              05/03 20:34:10 NetpValidateName: name 'JSIINC.COM' is valid for type 3                              05/03 20:34:10 NetpDsGetDcName: trying to find DC in domain 'JSIINC.COM', flags: 0x1020                              05/03 20:34:10 NetpDsGetDcName: found DC '\\jsi001.JSIINC.COM' in the specified domain                              05/03 20:34:10 NetpJoinDomain: status of connecting to dc '\\jsi001.JSIINC.COM': 0x0                              05/03 20:34:10 NetpGetLsaPrimaryDomain: status: 0x0                              05/03 20:34:10 NetpGetDnsHostName: Read NV Hostname: JSI009                              05/03 20:34:10 NetpGetDnsHostName: PrimaryDnsSuffix defaulted to DNS domain name: JSIINC.COM                              05/03 20:34:10 NetpLsaOpenSecret: status: 0xc0000034                              05/03 20:34:10 NetpGetLsaPrimaryDomain: status: 0x0                              05/03 20:34:10 NetpLsaOpenSecret: status: 0xc0000034                              05/03 20:34:11 NetpJoinDomain: status of setting machine password: 0x0                              05/03 20:34:11 NetpGetComputerObjectDn: Cracking DNS domain name JSIINC.COM/ into Netbios on \\jsi001.JSIINC.COM                              05/03 20:34:11 NetpGetComputerObjectDn: Crack results: 	name = JSIINC05/03 20:34:11 NetpGetComputerObjectDn: Cracking account name JSIINC\JSI009$ on \\jsi001.JSIINC.COM                              05/03 20:34:11 NetpGetComputerObjectDn: Crack results: 	(Account already exists) DN = CN=JSI009,CN=Computers,DC=JSIINC,DC=COM                              05/03 20:34:11 NetpModifyComputerObjectInDs: Initial attribute values:                              05/03 20:34:11 		DnsHostName  =  JSI009.JSIINC.COM                              05/03 20:34:11 		ServicePrincipalName  =  HOST/JSI009.JSIINC.COM  HOST/JSI009                              05/03 20:34:11 NetpModifyComputerObjectInDs: Computer Object already exists in OU:                              05/03 20:34:11 		DnsHostName  =                              05/03 20:34:11 		ServicePrincipalName  =                              05/03 20:34:11 NetpModifyComputerObjectInDs: Attribute values to set:                              05/03 20:34:11 		DnsHostName  =  JSI009.JSIINC.COM                              05/03 20:34:11 		ServicePrincipalName  =  HOST/JSI009.JSIINC.COM  HOST/JSI009                              05/03 20:34:11 ldap_unbind status: 0x0                              05/03 20:34:11 NetpJoinDomain: status of setting DnsHostName and SPN: 0x0                              05/03 20:34:11 NetpGetLsaPrimaryDomain: status: 0x0                              05/03 20:34:11 NetpSetLsaPrimaryDomain: for 'JSIINC' status: 0x0                              05/03 20:34:11 NetpJoinDomain: status of setting LSA pri. domain: 0x0                              05/03 20:34:11 NetpJoinDomain: status of managing local groups: 0x0                              05/03 20:34:11 NetpJoinDomain: status of setting netlogon cache: 0x0                              05/03 20:34:12 NetpJoinDomain: status of setting ComputerNamePhysicalDnsDomain to 'JSIINC.COM': 0x0                              05/03 20:34:12 NetpUpdateW32timeConfig: 0x0                              05/03 20:34:12 NetpJoinDomain: status of disconnecting from '\\jsi001.JSIINC.COM': 0x0                              05/03 20:34:12 NetpDoDomainJoin: status: 0x0