I tried following these steps in these two articles but I am still having problems re-installing wsus.
http://blogs.technet.com/b/sus/archive/2008/11/05/how-to-manually-remove-all-of-wsus.aspx
Please Help
Here is WSUSSetup.log
2012-11-01 10:18:55 Error MWUSSetup ParseCommandLine: Failed to open SOFTWARE\Microsoft\Update Services\Server\Setup registry key (Error 0x80070002: The system cannot find the file specified.)2012-11-01 10:19:41 Error MWUSSetup DoInstall: ParseCommandLine failed (Error 0x80041453)
2012-11-29 12:19:30 Success MWUSSetup Detected that setup was launched through Server Manager
2012-11-29 12:19:31 Success MWUSSetup Validating pre-requisites...
2012-11-29 12:19:31 Error MWUSSetup Failed to determine if an higher version of WSUS is installed. Assuming it is not... (Error 0x80070002: The system cannot find the file specified.)
2012-11-29 12:19:31 Error MWUSSetup WSUS is outdated. But this will not block setup (Error 0x00000000: The operation completed successfully.)
2012-11-29 12:19:34 Success MWUSSetup ReportViewer is not installed on this machine
2012-11-29 12:19:34 Success MWUSSetup ReportViewer is not installed on this machine
2012-11-29 12:20:24 Success MWUSSetup Initializing installation details
2012-11-29 12:20:24 Success MWUSSetup Skipping Asp.Net install since not running on win2k3...
2012-11-29 12:20:24 Success MWUSSetup Installing wYukon using ocsetup
2012-11-29 12:20:24 Success MWUSSetup Installing Windows Internal database using ocsetup with command line as "ocsetup "WSSEE" /quiet /norestart"
2012-11-29 12:20:56 Error MWUSSetup The process ocsetup "WSSEE" /quiet /norestart returned error: 0x643 (Error 0x80070643: Fatal error during installation.)
2012-11-29 12:20:56 Error MWUSSetup ExecCmd failed (Error 0x80070643: Fatal error during installation.)
2012-11-29 12:20:56 Error MWUSSetup Install Windows Internal database: Failed to execute "ocsetup "WSSEE" /quiet /norestart" (Error 0x80070643: Fatal error during installation.)
2012-11-29 12:20:56 Error MWUSSetup CInstallDriver::PerformSetup: Installation of wYukon failed (Error 0x80070643: Fatal error during installation.)
2012-11-29 12:20:56 Error MWUSSetup CSetupDriver::LaunchSetup: Setup failed (Error 0x80070643: Fatal error during installation.)
2012-11-29 12:21:02 Error MWUSSetup DoInstall: Wsus setup failed (Error 0x80070643: Fatal error during installation.)
2013-01-31 14:43:33 Success MWUSSetup Detected that setup was launched through Server Manager
2013-01-31 14:43:34 Success MWUSSetup Validating pre-requisites...
2013-01-31 14:43:34 Error MWUSSetup Failed to determine if an higher version of WSUS is installed. Assuming it is not... (Error 0x80070002: The system cannot find the file specified.)
2013-01-31 14:43:34 Error MWUSSetup WSUS is outdated. But this will not block setup (Error 0x00000000: The operation completed successfully.)
2013-01-31 14:43:36 Success MWUSSetup ReportViewer is not installed on this machine
2013-01-31 14:43:36 Success MWUSSetup ReportViewer is not installed on this machine
2013-01-31 14:44:32 Success MWUSSetup Initializing installation details
2013-01-31 14:44:32 Success MWUSSetup Skipping Asp.Net install since not running on win2k3...
2013-01-31 14:44:32 Success MWUSSetup Installing wYukon using ocsetup
2013-01-31 14:44:32 Success MWUSSetup Installing Windows Internal database using ocsetup with command line as "ocsetup "WSSEE" /quiet /norestart"
2013-01-31 14:45:01 Error MWUSSetup The process ocsetup "WSSEE" /quiet /norestart returned error: 0x643 (Error 0x80070643: Fatal error during installation.)
2013-01-31 14:45:01 Error MWUSSetup ExecCmd failed (Error 0x80070643: Fatal error during installation.)
2013-01-31 14:45:01 Error MWUSSetup Install Windows Internal database: Failed to execute "ocsetup "WSSEE" /quiet /norestart" (Error 0x80070643: Fatal error during installation.)
2013-01-31 14:45:01 Error MWUSSetup CInstallDriver::PerformSetup: Installation of wYukon failed (Error 0x80070643: Fatal error during installation.)
2013-01-31 14:45:01 Error MWUSSetup CSetupDriver::LaunchSetup: Setup failed (Error 0x80070643: Fatal error during installation.)
2013-01-31 14:46:06 Error MWUSSetup DoInstall: Wsus setup failed (Error 0x80070643: Fatal error during installation.)
2013-04-04 11:43:48 Success MWUSSetup Detected that setup was launched through Server Manager
2013-04-04 11:43:50 Success MWUSSetup Validating pre-requisites...
2013-04-04 11:43:50 Error MWUSSetup Failed to determine if an higher version of WSUS is installed. Assuming it is not... (Error 0x80070002: The system cannot find the file specified.)
2013-04-04 11:43:50 Error MWUSSetup WSUS is outdated. But this will not block setup (Error 0x00000000: The operation completed successfully.)
2013-04-04 11:43:52 Success MWUSSetup ReportViewer is not installed on this machine
2013-04-04 11:43:52 Success MWUSSetup ReportViewer is not installed on this machine
2013-04-04 11:44:40 Success MWUSSetup Initializing installation details
2013-04-04 11:44:40 Success MWUSSetup Skipping Asp.Net install since not running on win2k3...
2013-04-04 11:44:40 Success MWUSSetup Installing wYukon using ocsetup
2013-04-04 11:44:40 Success MWUSSetup Installing Windows Internal database using ocsetup with command line as "ocsetup "WSSEE" /quiet /norestart"
2013-04-04 11:45:05 Error MWUSSetup The process ocsetup "WSSEE" /quiet /norestart returned error: 0x643 (Error 0x80070643: Fatal error during installation.)
2013-04-04 11:45:05 Error MWUSSetup ExecCmd failed (Error 0x80070643: Fatal error during installation.)
2013-04-04 11:45:05 Error MWUSSetup Install Windows Internal database: Failed to execute "ocsetup "WSSEE" /quiet /norestart" (Error 0x80070643: Fatal error during installation.)
2013-04-04 11:45:05 Error MWUSSetup CInstallDriver::PerformSetup: Installation of wYukon failed (Error 0x80070643: Fatal error during installation.)
2013-04-04 11:45:05 Error MWUSSetup CSetupDriver::LaunchSetup: Setup failed (Error 0x80070643: Fatal error during installation.)
2013-04-04 11:46:11 Error MWUSSetup DoInstall: Wsus setup failed (Error 0x80070643: Fatal error during installation.)