原因分析：
可能是Software Protection服务丢失，即在services中无法找到该服务。
解决方法：
1、按”Win+R”组合键，调出运行框，输入: services.msc 并回车，查找Software Protection服务：
2、如果找不到Software Protection服务，那么我们可以参考如下方案，通过导入Software Protection键值，重建Software Protection服务，来解决该问题：
3、新建一个记事本文件，将以下文字复制粘贴到记事本中，以“SP.reg”命名并保存于桌面。
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicessppsvc]
"StartProtected"=dword:00000001
"DisplayName"="@%SystemRoot%system32sppsvc.exe,-101"
"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,
00,70,00,70,00,73,00,76,00,63,00,2e,00,65,00,78,00,65,00,00,00
"Start"=dword:00000002
"Type"=dword:00000010
"Description"="@%SystemRoot%system32sppsvc.exe,-100"
"DependOnService"=hex(7):52,00,70,00,63,00,53,00,73,00,00,00,00,00
"ObjectName"="NT AUTHORITYNetworkService"
"ServiceSidType"=dword:00000001
"RequiredPrivileges"=hex(7):53,00,65,00,41,00,75,00,64,00,69,00,74,00,50,00,72,
00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,43,00,68,00,
61,00,6e,00,67,00,65,00,4e,00,6f,00,74,00,69,00,66,00,79,00,50,00,72,00,69,
00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,43,00,72,00,65,00,
61,00,74,00,65,00,47,00,6c,00,6f,00,62,00,61,00,6c,00,50,00,72,00,69,00,76,
00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,49,00,6d,00,70,00,65,00,
72,00,73,00,6f,00,6e,00,61,00,74,00,65,00,50,00,72,00,69,00,76,00,69,00,6c,
00,65,00,67,00,65,00,00,00,00,00
"DelayedAutoStart"=dword:00000001
"FailureActions"=hex:80,51,01,00,00,00,00,00,00,00,00,00,03,00,00,00,14,00,00,
00,01,00,00,00,c0,d4,01,00,01,00,00,00,e0,93,04,00,00,00,00,00,00,00,00,00
[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicessppsvcSecurity]
"Security"=hex:01,00,14,80,a0,00,00,00,ac,00,00,00,14,00,00,00,30,00,00,00,02,
00,1c,00,01,00,00,00,02,80,14,00,ff,01,0f,00,01,01,00,00,00,00,00,01,00,00,
00,00,02,00,70,00,05,00,00,00,00,00,14,00,ff,01,02,00,01,01,00,00,00,00,00,
05,12,00,00,00,00,00,18,00,fd,01,0f,00,01,02,00,00,00,00,00,05,20,00,00,00,
20,02,00,00,00,00,14,00,9d,01,02,00,01,01,00,00,00,00,00,05,04,00,00,00,00,
00,14,00,9d,01,02,00,01,01,00,00,00,00,00,05,06,00,00,00,00,00,14,00,14,00,
00,00,01,01,00,00,00,00,00,05,0b,00,00,00,01,01,00,00,00,00,00,05,12,00,00,
00,01,01,00,00,00,00,00,05,12,00,00,00
[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicessppsvcTriggerInfo]
[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicessppsvcTriggerInfo]
"Type"=dword:00000014
"Action"=dword:00000001
"GUID"=hex:da,8a,52,f5,5f,be,14,4f,8a,ef,a9,5d,e7,28,11,61
4、请您双击“SP.reg”，当系统提示您是否确认导入注册表时，请点击“是”。之后会有提示说明已经成功导入注册表。
5、重启后，再次进入”服务”控制面板查看，可以找到Software Protection服务，右击并选择启用。
Software Protection是一个重要的服务，Win8系统提示无效的产品密钥，且报错0x80070424都是由此服务丢失导致的，遇到这种故障的用户可以通过小编介绍的方法，导入修改注册表便可恢复这项服务。
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