The correct and supported method would be to uninstall the web agent and then re-install the web agent. The CA SSO/Siteminder components can be located in the Windows Registry and the file system using Windows Explorer.
[Windows Registry]
HKEY_LOCAL_MACHINE\SOFTWARE\Netegrity\SiteMinder Web Agent\CurrentVersion
Location = C:\Program Files\CA\webagent\win64
SM_DEFAULT_HOST_FILE = C:\Program Files\CA\webagent\win64\config\SmHost.conf
HKEY_LOCAL_MACHINE\SOFTWARE\Netegrity\SiteMinder Web Agent\Microsoft IIS
configfile = C:\Program Files\CA\webagent\win64\bin\IIS\WebAgent.conf
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\CA SiteMinder Web Agent
DisplayIcon = C:\Program Files\CA\webagent\win64\CA.ico
InstallLocation = C:\Program Files\CA\webagent\win64
UninstallString = "C:\Program Files\CA\webagent\win64\install_config_info\ca-wa-uninstall\uninstall.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Netegrity\SiteMinder Web Agent
Location = C:\Program Files\CA\webagent\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Netegrity\SiteMinder Web Agent\Microsoft IIS
configfile = C:\Program Files\CA\webagent\win32\bin\IIS\WebAgent.conf
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[File System]
C:\Program Files\CA\webagent