一定是中毒了，请查杀病毒和流氓软件。如果杀毒之后仍然如此，那就试试这种方法：
防火墙项添加到注册表
如果正确修改注册表通过使用注册表编辑器或者通过使用其他方法 警告 可能发生 Serious 问题。 这些问题可能需要重新安装操作系统。 Microsoft 不能保证可以解决这些问题了。 修改注册表需要您自担风险
。
要将 Windows 防火墙项添加到注册表, 请按照下列步骤操作： 1. 将以下文本复制到记事本, 然后再保存文件作为 Sharedaccess.reg：
Windows Registry Editor Version 5.00
[-HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess]
“DependOnGroup”=hex(7):00,00
“DependOnService”=hex(7):4e,00,65,00,74,00,6d,00,61,00,6e,00,00,00,57,00,69,00,\
6e,00,4d,00,67,00,6d,00,74,00,00,00,00,00
“Description”=”Provides network address translation, addressing, name resolution and/or intrusion prevention services for a home or small office network.”
“DisplayName”=”Windows Firewall/Internet Connection Sharing (ICS)”
“ErrorControl”=dword:00000001
“ImagePath”=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\
74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,\
00,76,00,63,00,68,00,6f,00,73,00,74,00,2e,00,65,00,78,00,65,00,20,00,2d,00,\
6b,00,20,00,6e,00,65,00,74,00,73,00,76,00,63,00,73,00,00,00
“ObjectName”=”LocalSystem”
“Start”=dword:00000002
“Type”=dword:00000020
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Epoch]
“Epoch”=dword:00002cd0
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters]
“ServiceDll”=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,\
00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,\
69,00,70,00,6e,00,61,00,74,00,68,00,6c,00,70,00,2e,00,64,00,6c,00,6c,00,00,\
00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List]
“%windir%\\system32\\sessmgr.exe”=”%windir%\\system32\\sessmgr.exe:*:enabled:@xpsp2res.dll,-22019”
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List]
“%windir%\\system32\\sessmgr.exe”=”%windir%\\system32\\sessmgr.exe:*:enabled:@xpsp2res.dll,-22019”
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Setup]
“ServiceUpgrade”=dword:00000001
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Setup\InterfacesUnfirewalledAtUpdate]
“All”=dword:00000001
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Enum]
“0”=”Root\\LEGACY_SHAREDACCESS\\0000″
“Count”=dword:00000001
“NextInstance”=dword:00000001
2. 双击 Sharedaccess.reg 将此文件的内容合并到注册表并可创建防火墙项。
3. 重新启动 Windows。
4. 然后单击 确定 、 开始 ， 键入 cmd , 和 运行 。
5. 在命令提示符, 键入以下命令, 然后按 ENTER 键：
Netsh 防火墙复位
6. 然后单击 确定 、 开始 、 键入 firewall.cpl , 和 运行 。
7. 配置与要使用 Windows 防火墙设置。
来源URL：http://blog.csdn.net/nsrainbow/article/details/8451385