Windows firewall helps keep your PC protected from unauthorized access and save your critical data and files stored inside.To configure your firewall follow my blog-How to configure the Windows Firewall in windows 7.
Step1: Check the software CD, DVD, or other media for any physical damage such as scratches, dirt or cracks. If the disk is dirty or contains scratches, then clean it .If it is cracked or damaged, purchase of a new CD, DVD or other media is required.
Step2: Confirm your CD drive is working properly .You can check by inserting another CD and running the program. If it is working properly, try once more to install the desired software.
Step3: Insert software CD/DVD and open the folder until you see the file with the ".exe" extension.
Step4: Select run from start menu in the lower left of the screen.
Step5: Type cmd in the run box to open a command prompt window. A blank window will appear with c: in the left corner.
Step6: Click and drag the file with the ".exe" extension to the blank "CMD" window.
Step7: Drop or release the left mouse button once the ".exe" file is inside of the blank "CMD" window. The path of the ".exe" file will display after the "C:\" prompt.
Step8: Press the space bar once, type /NCRC, and press the enter key. The software will begin to install, bypassing the NSIS error.
The popular operating system windows 7 is giving slow performance .It can be many reason ,to find the reason and solution follow this article-Reasons Why Windows 7 Performs Slow.
Note:You can reach V tech-squad online technical support for any of your queries relate to Windows 7 Support at their Toll Free No +1-877-452-9201.