Such serious reasons may in particular be a conflict with firewall firewall third-party set (or — installed ) to the computer , or its incompatibility with other software . To configure Windows Firewall to take effect, click OK. To exit this mode without saving any changes , click Cancel. How to allow your application to work through Windows Firewall Windows 7 firewall by default blocks the work of the majority of the applications installed on your computer . Actually, largely thanks to this and achieved a high level of computer security : if a malicious program tries to start up performance — it will be immediately blocked and can continue only after the permission of the user. However, this mode of operation the firewall is not always optimal , because it does not distinguish which program is launched for execution — malicious or normal . In particular, when the operating system firewall blocks most likely applications are in startup folder . Accordingly , the question arises whether it is possible , without disabling the firewall , use the programs that it blocks , and if so — how to do this ? To resolve this problem in Windows 7 Firewall implemented the ability to generate a list of exceptions. Added to the list the program that should not be blocked by a firewall . For example, if you have installed and placed in the startup directory program ICQ, then in order for it to run concurrently with the operating system is loaded , it must be added to the firewall exceptions list Windows. Otherwise, it will be blocked from downloading . It is worth noting that every time you add a new program to the exceptions list computer security decreases. In other words, the more the list of exceptions , the more opportunities there hackers and other intruders, as well as from malicious programs to run «worms» , gaining access to the computer contents , or use it to spread malicious software to other computers , as well as in other unlawful purposes . To minimize possible risks , add a program to the exceptions list only when it is really necessary .