Hi
"HTTP 404 – Page cannot be found” error has been fixed in this knowledge base, please have a look and check whether it works for you.
http://support.microsoft.com/kb/248033
If problem still remains, please try the following steps.
1. On the SharePoint Server where Central Administration Site is hosted, go to
C:\Documents and Settings\All Users\Application Data\Microsoft\SharePoint\Config\<guid>
2. Backup the cache.ini file then edit the cache.ini and replace the current value with "1".
3. Restart the Windows SharePoint Services Timer service.
4. Verify the cache.ini now contains its original value.
5. Run the SharePoint Products and Technologies Configuration wizard again.
If steps listed above do not fix your issue, please try to uninstall your SharePoint and run the setup to install this product again.
Best Regards!