If you are trying to install Oracle 10.2.0.3 client on a Windows 2008 server and you get the following error:

OUI.EXE has stopped working
Close the program
 
For some reason, the Oracle installer is having problem with long directory structures.
To overcome this, you can simply copy the installtion directory to a location with a shorter path.
1)create a new Temp [...]

Even Oracle veterans may encounter some challenges when it comes to setting an odbc  using the Oracle XE Client.    As every DBA will tell you, you will need to configure the tnsnames.ora  (using  net configuration Assistant or by going  to oracle home\network\admin and edit it manually). After that, theTNS Service name in the ODBC [...]

If the Oracle client was installed using the domain administrator account instead of the local administrator, the following message could be displayed when trying to connect:
ORA-12638: Credential retrieval failed
From the wording of the error message one could think that this error means that he is using the wrong password but this is not the [...]

If you are trying to upgrade the Oracle Client and an error message is displayed telling you that  msvcr71.dll is in use, try the following:
1) Verify that all Oracle services are stopped.
2) Stop the Distributed Transaction Coordinator – In most cases this will solve the issue.
3) Run Process Explorer
a) In the Find menu, click [...]