InnoSetup - the question is how to register in the registry and after installation, register other values?

Question

Installer

It's about InnoSetup: www.jrsoftware.org/isinfo.php
How to register registry changes like these in InnoSetup?
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyEnable /t REG_DWORD /d 1 /f
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyServer /t REG_SZ / d xxx.xxx.xxx.xxx:xxxx /f
And then, after the installer has completed the .exe file, I need to return these keys to their native values:
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyServer /t REG_SZ /d /f
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings"
/v ProxyEnable /t REG_DWORD /d 0 /f How to do it? I tried the example below but it doesn't work.
[Registry]
Root: HKLM; Subkey: "Software\Microsoft\Windows\CurrentVersion\Internet Settings"; ValueType: string; ValueName: "ProxyEnable"; ValueData: 1
Root: HKLM; Subkey: "Software\Microsoft\Windows\CurrentVersion\Internet Settings"; ValueType: string; ValueName: "ProxyServer"; ValueData: "xxx.xxx.xxx.xxx:xxxx"
[Run]
Filename: "file.exe";
[Registry]
Root: HKLM; Subkey: "Software\Microsoft\Windows\CurrentVersion\Internet Settings"; ValueType: string; ValueName: "ProxyEnable"; ValueData: 0
Root: HKLM; Subkey: "Software\Microsoft\Windows\CurrentVersion\Internet Settings"; ValueType: string; ValueName: "ProxyServer";
it is necessary to delete value As it is correct after working out Filename: "file.exe"; write changes to the registry?
Thank you.