ODT v11 Beta Installation Problem - Can't connect to Database

Hi, I'm having difficulties setting up the ODT 11.1.0.5.10 beta. I'm fairly new to Oracle so I apologise if I've missed something obvious!
First of all I tried installing ODT 10.2.0.2.21 and that worked fine (after I copies tnsnames into the appropriate folder).
However, after installing v11 I can't connect to any of our databases anymore, either through VS2005 of PL/SQL developer, which we normally use. When I try to set up a data connection (in VS Server Explorer) using ODP.Net, I get 'ORA-12154: TNS: Could not resolve the connect identifier specified'.
If I try to make a connection using the .Net Framework data Provider for Oracle, I get 'ORA-12541: TNS: no listener'.
Testing the connection using Oracle Net Manager, however, succeeds without a problem.
i put the tnsnames file in there, so that's not the problem. I'm not sure if the installation worked properly, as there are a lot less files & folders in the new Home added for the beta than in the one added for v10.2
Any thoughts?
Thanks,
Grant

Yeah, you could be onto something with the path, thanks - it seems like the installer for the v11 Beta misses \bin off the end of the new Oracle home path, which causes problems. Since fixing that, I can now connect with PL/SQL developer.
however, I am still facing one problem which my colleague also seems to have. We have an 8.1 client installed, and when we try to set up a connection with VS2005, it uses the tnsnames from the 8.1 client.
There is also a strange issue whereby if you go into the advanced settings, the database name is only set to the first couple of characters of the actual name, which is probably why it isn't working. However, if I set the correct name in the advanced settings, when you come out of that dialogue into the standard connection dialogue, the database has reverted back to the first one in the list, putting me in a most annoying vicious circle..
Even this problem has now taken a back seat as I am now unable to load the connection screen at all' getting a 'Package Load failure' message (it seems to think the package is using a GUID which isn't on the system). This remains even if i reinstall the v11 Beta. I'm not sure how I got into this situation, but it seems that there is some DLL registered in VS2005 which is now incorrect and doesn't get reset on uninstall/installation.
If anyone has any thoughts on my myriad problems please share them with me!
Thanks,
Grant

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