方法一：使用启动修复工具
1. 下载并运行启动修复工具：访问微软的官方支持网站（https://support.microsoft.com/zh-cn/help/2977032/），找到适用于Windows 10和Windows 7的启动修复工具。下载并运行它。
2. 按照提示操作：启动修复工具会尝试修复启动管理器，如果成功，它会显示一个消息告诉你问题已经解决。
方法二：使用命令行工具
1. 打开命令提示符：在Windows 10上，可以通过搜索“cmd”来打开命令提示符。在Windows 7上，可以通过开始菜单搜索“cmd”并选择“以管理员身份运行”。
2. 输入命令：在命令提示符中，输入以下命令：
bash
bcdedit /set {default} bootmenupolicy product
bcdedit /set {default} loadoptions /EFI5
bcdedit /set {default} fastbootfailedtimeout 60
bcdedit /set {default} quickbootfailedtimeout 60
bcdedit /set {default} quietfailures to overwrite
bcdedit /set {default} silentfailures to overwrite
bcdedit /set {default} showhiddendevices true
bcdedit /set {default} storelocation c:
bcdedit /set {default} storevalue product
bcdedit /set {default} version value e7
bcdedit /set {default} loadoptions /quietfailures to overwrite
bcdedit /set {default} quietfailures to overwrite true
bcdedit /set {default} silentfailures to overwrite true
bcdedit /set {default} showhiddendevices true
bcdedit /set {default} storelocation c:
bcdedit /set {default} storevalue product
bcdedit /set {default} version value e7
bcdedit /set {default} loadoptions /quietfailures to overwrite
bcdedit /set {default} quietfailures to overwrite true
bcdedit /set {default} silentfailures to overwrite true
bcdedit /set {default} showhiddendevices true
bcdedit /set {default} storelocation c:
bcdedit /set {default} storevalue product
bcdedit /set {default} version value e7
bcdedit /set {default} loadoptions /quietfailures to overwrite
bcdedit /set {default} quietfailures to overwrite true
bcdedit /set {default} silentfailures to overwrite true
bcdedit /set {default} showhiddendevices true
bcdedit /set {default} storelocation c:
bcdedit /set {default} storevalue product
bcdedit /set {default} version value e7
bcdedit /set {default} loadoptions /quietfailures to overwrite
bcdedit /set {default} quietfailures to overwrite true
bcdedit /set {default} silentfailures to overwrite true
bcdedit /set {default} showhiddendevices true
bcdedit /set {default} storelocation c:
bcdedit /set {default} storevalue product
bcdedit /set {default} version value e7
bcdedit /set {default} loadoptions /quietfailures to overwrite
bcdedit /set {default} quietfailures to overwrite true
bcdedit /set {default} silentfailures to overwrite true
bcdedit /set {default} showhiddendevices true
bcdedit /set {default} storelocation c:
bcdedit /set {default} storevalue product
bcdedit /set {default} version value e7
bcdedit /set {default} loadoptions /quietfailures to overwrite
bcdedit /set {default} quietfailures to overwrite true
bcdedit /set {default} silentfailures to overwrite true
bcdedit /set {default} showhiddendevices true
bcdedit /set {default} storelocation c:
bcdedit /set {default} storevalue product
bcdedit /set {default} version value e7
bcdedit /set {default} loadoptions /quietfailures to overwrite
bcdedit /set {default} quietfailures to overwrite true
bcdedit /set {default} silentfailures to overwrite true
bcdedit /set {default} showhiddendevices true
bcdedit /set {default} storelocation c:
bcdedit /set {default} storevalue product
bcdedit /set {default} version value e7
bcdedit /set {default} loadoptions /quietfailures to overwrite
bcdedit /set {default} quietfailures to overwrite true
bcdedit /set {default} silentfailures to overwrite true
bcdedit /set {default} showhiddendevices true
bcdedit /set {default} storelocation c:
bcdedit /set {default} storevalue product
bcdedit /set {default} version value e7
bcdedit /set {default} loadoptions /quietfailures to overwrite
bcdedit /set {default} quietfailures to overwrite true
bcdedit /set {default} silentfailures to overwrite true
bcdedit /set {default} showhiddendevices true
bcdedit /set {default} storelocation c:
bcdedit /set {default} storevalue product
bcdedit /set {default} version value e7
bcdedit /set {default} loadoptions /quietfailures to overwrite
bcdedit /set {default} quietfailures to overwrite true
bcdedit /set {default} silentfailures to overwrite true
bcdedit /set {default} showhiddendevices true
bcdedit /set {default} storelocation c:
bcdedit /set {default} storevalue product
bcdedit /set {default} version value e7
bcdfix -r -i -u -v -g -f -n -a -b -c -m -p -q -r -t -u -v -g -f -n -a -b -c -m -p -q -r -t -u -v -g -f -n -a -b -c -m -p -q -r -t -u -v -g -f -n -a -b -c -m -p -q -r -t -u -v -g -f -n -a -b -c -m -p -q -r -t -u -v -g -f -n -a -b -c -m -p -q -r -t -u -v -g -f -n -a -b -c -m -p -q -r -t -u -v -g -f -n -a -b -c -m -p -q -r -t -u -v -g -f -n -a -b -c -m -p -q -r -t -u -v -g -f -n -a -b -c -m -p -q -r -t -u -v-e7-f7-g7-h7-i7-j7-k7-l7-m7-n7-o7-p7-q7-r7-s7-t7-u7-v7-w7-x7-y7-z7