Hi,
1. What happens when you try to install the software from your DVD?
2. Do you get any error message?
Follow the steps and check if it helps.
Method 1:Try an flat installation of the software
a) Copy the content of the DVD and paste it on desktop
b) Run the copied file from the desktop to install the software.
Method 2:I would suggest you to put the computer in clean boot and then try to install the software.
http://support.microsoft.com/kb/929135
Note: Please follow the step no:7 from the above link to put the computer in normal mode.
LG Electronics BH12LS35 DVD Burner is compatible with windows 7 and it does not require any additional software.