SHAREPOINT CENTRAL ADMINISTRATION V3' page not found

If in the event log you see
Could not load all ISAPI filters for site 'SHAREPOINT CENTRAL ADMINISTRATION V3'. Therefore site startup aborted.

Try this:
// Disabling the 32bit mode for your web site.
cscript C:\inetpub\adminscripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 0
and then the following
// Registering ASP.NET 2.0 as the default framework for that web site
C:\Windows\Microsoft.NET\Framework64\v2.0.50727>
aspnet_regiis.exe -i

Pasted from