该文件常见出现的位置

版本	位置
2.0.50727.42(RTM.050727-4200)	\Windows\Microsoft.NET\Framework\v2.0.50727
2.0.50727.5456(Win7SP1GDR.0507	\Windows\Microsoft.NET\Framework\v2.0.50727
1.0.4292.00	\ProgramFiles\MicrosoftVisualStudio8\SmartDevices\SDK\CompactFramework\2.0\v1.0\WindowsCE
2.0.5238.00	\ProgramFiles\MicrosoftVisualStudio8\SmartDevices\SDK\CompactFramework\2.0\v2.0\Debugger\BCL
2.0.5238.00	\ProgramFiles\MicrosoftVisualStudio8\SmartDevices\SDK\CompactFramework\2.0\v2.0\WindowsCE
2.0.50727.4927(NetFXspW7.05072	\Windows\Microsoft.NET\Framework\v2.0.50727
0.7.5.14	\ProgramFiles\QQGAME\Bin\Ark
4.0.50401.0(SL_V4_RTW.050401-0	\ProgramFiles\MicrosoftSilverlight\4.0.50401.0
3.0.40723.0(SL_V3_RTW.040723-0	\ProgramFiles(x86)\WindowsLive\Mesh
4.0.30319.269builtby:RTMGDR	\Windows\Microsoft.NET\Framework\v4.0.30319
2.0.50727.5467(Win7SP1GDR.0507	\Windows\Microsoft.NET\Framework\v2.0.50727
5.0.10411.00builtby:SL_V5_SVC	\ProgramFiles\MicrosoftSilverlight\5.1.10411.0
4.1.10329.0(SL_V4_SVC.010329-0	\ProgramFiles\MicrosoftSilverlight\4.1.10329.0
4.0.30319.1001builtby:RTMGDR	\Windows\Microsoft.NET\Framework\v4.0.30319
2.0.50727.5447(Win7SP1GDR.0507	\Windows\Microsoft.NET\Framework\v2.0.50727

一、如果您的系统提示“没有找到system.dll”或者“缺少system.dll”等类似错误信息，请把system.dll下载到本机
二、直接拷贝该文件到系统目录里：
　 1、Windows NT/2000系统，则复制到C:\WINNT\System32目录下。
2、Windows XP/Vista/Win7/8系统，则复制到C:\Windows\System32目录下。
三、然后打开“开始-运行-输入regsvr32 system.dll”，回车即可解决错误提示！