Environment Varible PATH exceeding recommended length solution?
I found the exact solution: and your exactly correct Max Vernon.

"Problem causes problems when installing an Oracle 11g database on a machine which already has a lot of different software installed,
On win 7 64bit, go to PATH variable(Right click on my computer>properties>Advanced system Settings>Advanced Tab>click on Envirnment variable>in system variable - look for Path>


When the failure occurs during installation of Oracle 11g, click on cancel, you will need to restart the installation from scratch
On win 7 64bit, go to PATH variable(Right click on my computer>properties>Advanced system Settings>Advanced Tab>click on Envirnment variable>in system variable - look for Path>
Find the Path environment in the System Variables window and edit it, click on it and select all the values within it,
paste these into a word document or something and save it. You might wish to see whats needed and what isnt but thats a different problem !
Clear the Path environment and simply add a single directory such as c:\Seer
Start the installation of Oracle 11g again and sit there and wait while it chunders through the processing.
Return to the Environment Variables and paste the originals back after the new ones put in by the installation "