Run Console.app to display your system.log. You could probably find the kext that is causing trouble just by looking at that, but it is probably easier to force a cache rebuild... so use Kext Wizard and choose 'Rebuild cache" and view the system.log while it is working. You should see some messages from kextcache that indicate the problem.
If all else fails, do a clean install...
i ran console and checked my system log this the message i received but im not sure what im looking for can you assist:
Mar 11 13:13:34 localhost Dock[151]: no information back from LS about running process
Mar 11 13:13:35 localhost Installer[345]: CoreAnimation: warning, deleted thread with uncommitted CATransaction; set CA_DEBUG_TRANSACTIONS=1 in environment to log backtraces.
Mar 11 13:13:53 --- last message repeated 3 times ---
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_authenticate(): Got user: michaelvasquez
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_authenticate(): Got ruser: (null)
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_authenticate(): Got service: authorization
Mar 11 13:13:53 localhost authorizationhost[354]: in od_principal_for_user(): No authentication authority returned
Mar 11 13:13:53 localhost authorizationhost[354]: in od_principal_for_user(): failed: 7
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_authenticate(): Failed to determine Kerberos principal name.
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_authenticate(): Done cleanup3
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_authenticate(): Kerberos 5 refuses you
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_authenticate(): pam_sm_authenticate: ntlm
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_acct_mgmt(): OpenDirectory - Membership cache TTL set to 1800.
Mar 11 13:13:53 localhost authorizationhost[354]: in od_record_check_pwpolicy(): retval: 0
Mar 11 13:13:53 localhost authorizationhost[354]: in od_record_attribute_create_cfstring(): returned 2 attributes for dsAttrTypeStandard:AuthenticationAuthority
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_setcred(): Establishing credentials
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_setcred(): Got user: michaelvasquez
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_setcred(): Context initialised
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_setcred(): Got euid, egid: 0 0
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_setcred(): Done getpwnam()
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_setcred(): Done setegid() & seteuid()
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_setcred(): pam_sm_setcred: krb5 user michaelvasquez doesn't have a principal
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_setcred(): Done cleanup3
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_setcred(): Done seteuid() & setegid()
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_setcred(): Done cleanup4
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_setcred(): pam_sm_setcred: ntlm
Mar 11 13:13:53 localhost authorizationhost[354]: in pam_sm_setcred(): pam_sm_setcred: no domain found skipping
Mar 11 13:13:53 localhost com.apple.SecurityServer[15]: UID 501 authenticated as user michaelvasquez (UID 501) for right 'system.install.software'
Mar 11 13:13:53 localhost com.apple.SecurityServer[15]: Succeeded authorizing right 'system.install.software' by client '/System/Library/PrivateFrameworks/Install.framework/Versions/A/Resources/runner' [351] for authorization created by '/System/Library/CoreServices/Installer.app' [345] (100003,0)
Mar 11 13:13:53 localhost coreservicesd[31]: Application App:"Installer" [ 0x0/0x29029] @ 0x0x7fd699629cc0 tried to be brought forward, but isn't in fPermittedFrontASNs ( ( ASN:0x0-0x2b02b
), so denying.
Mar 11 13:13:53 localhost WindowServer[71]: [cps/setfront] Failed setting the front application to Installer, psn 0x0-0x29029, securitySessionID=0x186a2, err=-13066
Mar 11 13:13:53 localhost com.apple.SecurityServer[15]: Succeeded authorizing right 'system.install.apple-software' by client '/System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/Resources/installd' [355] for authorization created by '/System/Library/CoreServices/Installer.app' [345] (4,0)
Mar 11 13:13:53 localhost com.apple.SecurityServer[15]: Succeeded authorizing right 'system.install.software' by client '/System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/Resources/installd' [355] for authorization created by '/System/Library/CoreServices/Installer.app' [345] (4,0)
Mar 11 13:13:55 localhost com.apple.SecurityServer[15]: Succeeded authorizing right 'com.apple.ServiceManagement.daemons.modify' by client '/usr/libexec/UserEventAgent' [10] for authorization created by '/usr/libexec/UserEventAgent' [10] (100012,0)
Mar 11 13:13:58 localhost com.apple.kextd[11]: kextcache error while updating / (error count: 30)
Mar 11 13:13:59 localhost com.apple.SecurityServer[15]: Succeeded authorizing right 'com.apple.ServiceManagement.daemons.modify' by client '/usr/libexec/UserEventAgent' [10] for authorization created by '/usr/libexec/UserEventAgent' [10] (100012,0)
Mar 11 13:13:59 localhost Installer[345]: CoreAnimation: warning, deleted thread with uncommitted CATransaction; set CA_DEBUG_TRANSACTIONS=1 in environment to log backtraces.
Mar 11 13:13:59 localhost Installer[345]: The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.
Mar 11 13:14:03 localhost com.apple.kextd[11]: /: kextcache has had enough tries; not launching any more
Mar 11 13:17:27 localhost mds[47]: (Warning) Server: No stores registered for metascope "kMDQueryScopeComputer"
i also ran kext wizard and did a clean install but didnt help