To fix the issue of adding/removing programs and IE by entering "regedit" in the Run dialog box, open the Registry Editor and locate the following item: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{5783F2D7-0101-0804-0002-0060B0CE6BBA}]. On the right side, there is a DisplayIcon whose value is "&...\acad.exe,-1". Modify it by replacing the "-1" with "0". Then check the Control Panel again, and it should be normal.
```cmd
regsvr32 Appwiz.cpl /s
regsvr32 Mshtml.dll /s
regsvr32 Jscript.dll /s
regsvr32 Msi.dll /s
```
These commands will re-register the necessary components to ensure that the Add/Remove Programs feature and Internet Explorer functionality are restored.