Website not working on new server

Hi,

I follow this document to move IIS website from Server 2003 X32 to 2008 R2 X64

https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/ff633422(v=ws.10)

After moving the site I was getting following error

 There was an error while performing this operation.

Details:

 Filename:
\\?\C:\Windows\system32\inetsrv\config\applicationHost.config
Error:

But after following this site i fix the problem

https://blogs.iis.net/wonyoo/workaround-running-asp-net-1-1-on-vista-sp2-ws08-sp2

But now I get this error when I try to load the site.

Service Unavailable

--------------------------------------------------------------------------------

HTTP Error 503. The service is unavailable.

and on other site I get this error

HTTP Error 500.0 - Internal Server Error
Calling GetFilterVersion on ISAPI filter "C:\program files\Citrix\Licensing\LMC\Tomcat\bin\win32\i386\isapi_redirect.dll" failed Detailed Error Information
Module IIS Web Core
Notification Unknown
Handler StaticFile
Error Code 0x80070002
Requested URL http://localhost:80/Timesheet
Physical Path C:\TIMESHEET
Logon Method Not yet determined
Logon User Not yet determined