WinPcap4.13无法安装解决方法
a previous version of winpcap has been detected on this system and cannot be removed because in use by another application. please close all the winpcap-based applications and run the installer again.
百度搜索后采用很多建议都没成功，在国外网站看到如下信息：
http://translate.google.co.jp/translate?hl=ja&sl=en&tl=ja&u=http://nicolask.wordpress.com/2012/09/23/solved-winpcap-4-12-install-error/&anno=2
打不开国外链接的话，可参考如下：
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[Solved] – WinPCap 4.12 install error
If you see this error, “A previous version of WinPcap has been detected on this system and cannot be removed because in use by another application.Please close all the WinPcap-based applications and run the installer again.”
Try rename these 2 files and re-run the installation again,
C:\Windows\SysWOW64>ren wpcap.dll wpcap.dll.old
C:\Windows\SysWOW64>ren packet.dll packet.dll.old
4.0.0.1040 shp 88,704 11-07-2007 packet.dll.old
4.0.0.1040 shp 240,248 11-07-2007 wpcap.dll.old
After successful installation,
4.1.0.2001 shp 96,784 – 06-26-2010 packet.dll
4.1.0.2001 shp 281,104 06-26-2010 wpcap.dll
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找到相应文件，并把扩展名修改即可：
● C:\Windows\SysWOW64 的wpcap.dll改成 wpcap.dll.old
● C:\Windows\SysWOW64的packet.dll改成 packet.dll.old
其实参照如上做法就可以顺利的把 WinPcap4.13 安装成功哟，试一下吧！