Instructions
Visit the SecuROM.com website in your browser, download the "Manual Release Date Check" tool and save it on your hard drive.
Click on "Start" and select "Computer."
Navigate to the folder where you saved the downloaded file, right-click on it and choose "Extract."
Open the extracted directory and double-click on the "Borderland-ManualReleaseDateCheck.exe" file.
Click on "Save" to save a manual activation file on your hard drive. Select the folder into which you wish to save the file and click on "Save" again.
Open the "Borderlands Manual Release Date Check" section of the SecuROM.com website in your browser.
Click on "Choose File" and use the file browser to locate the activation file on your hard drive. Click on "Open" and select "Submit." Your browser will automatically start downloading a license file, which you should save on your hard drive.
Launch the "Borderlands" installer again. When you reach the activation screen, select "Manual Activation."
Use the file browser to locate the license file on your hard drive and click on "Activate." You should now be able to finish the installation.