C language is not supporting in my laptop - Compaq PWS 5100 (297919001) Expansion Module

A "language monitor" is a term which applies to communications between a spooler and a printer. If that is indeed what you are searching for, here is a starting point:

https://docs.microsoft.com/en-us/windows-hardware/drivers/print/language-monitors

But if you are actually seeking a way to change the computer's displayed language:

https://www.pcmag.com/news/how-to-add-support-for-another-language-in-windows-10

https://support.microsoft.com/en-us/help/4027670/windows-10-add-and-switch-input-and-display-language-preferences

Here is how to install a language bar, a floating bar permitting switching of languages:

https://winaero.com/blog/enable-language-bar-windows-10/

If it is the whole's computer language, you have to re-install the operating system, but get a copy that is in english language.

Taken from Microsoft's site:

The display language is the language that Windows uses in wizards, dialog boxes, menus, Help and Support topics, and other items in the user interface. Some display languages are installed by default, and others require you to install additional language files. When you change the display language, it is changed for your user account and is not changed on the Welcome screen. If you want to set the display language for multiple users or the Welcome screen, see Apply regional and language settings to reserved accounts.

1. Open Regional and Language Options by clicking the Start button , clicking Control Panel, clicking Clock, Language, and Region, and then clicking Regional and Language Options.
2. Click the Keyboards and Languages tab.
3. Under Display language, choose a language from the list, and then click OK.

Direct link to Microsoft's site:
Change the display language

Hope this helps!

For XP
Steps to change the default system language (Windows XP)

1. Open the Control Panel.
2. Open Regional and Language Options.
3. Click the Languages tab.
4. Ensure Supplemental language support items are checked.
5. Click the Advanced tab.
6. Select the language from the list in the Language for non-Unicode programs.

Windows 7

1. Open Regional and Language Options by clicking the Start button, clicking Control Panel, clicking Clock, Language, and Region, and then clicking Regional and Language Options.

2. Click the Keyboards and Languages tab.

3. Under Display language, choose a language from the list, and then click OK.

1. Open Regional and Language Options by clicking the Start button , clicking Control Panel, clicking Clock, Language, and Region, and then clicking Regional and Language Options.
   

2. Click the Keyboards and Languages tab.
   

3. Under Display language, choose a language from the list, and then click OK.
   

Hi

Go to the control panel, click on the icon that looks like a globe; you have a drop down menu that will change to any language.

On a Windows Acer laptop, the display language is the language used to display text in wizards, dialog boxes, menus, support topics, Help menus and other components and interfaces. By default, your Acer laptop comes with a variety of display languages you can choose from if you are interested in changing the language. Alternatively, you can also install display languages.

Click the Windows "Start" menu, click the "Control Panel," click "Clock, Language, and Region," and then click "Regional and Language Options."

Click the "Keyboards and Languages" tab, and then select the language you want to use under "Display Language."

Click the "Install/Uninstall" button if you do not see the language you want to use. This launches the language installation wizard. Follow the guided prompts. If prompted, type your administrator password. Click "OK" to save the changes.

Please get back to us if you have further query else please accept the suggestion.

Thank you for contacting fixya.com

1. Click on Start button, then go to Control Panel.
2. 
   
3. In Category view, click on Clock, Language, and Region link, and then click on Change display language link under "Region and Language" section. In Icons view, click on Region and Language icon, and then go to Keyboards and Languages tab.
   
4. Under "Display language" section, choose a display language from the list of installed language packs. Note: If no list of display languages is shown, make sure that you have installed additional language packs as the list will only applicable if there is more than 1 display languages available in supported editions of Windows 7.
   
5. Click Apply.

Yes you need to install a language pack, he display language is the language that Windows uses in wizards, dialog boxes, menus, Help and Support topics, and other items in the user interface. Some display languages are installed by default, and others require you to install additional language files. When you change the display language, it is changed for your user account and is not changed on the Welcome screen. If you want to set the display language for multiple users or the Welcome screen, see Apply regional and language settings to reserved accounts.

1. Open Regional and Language Options by clicking the Start button , clickingControl Panel, clicking Clock, Language, and Region, and then clicking Regional and Language Options.
   
2. Click the Keyboards and Languages tab.
   
3. Under Display language, choose a language from the list, and then click OK.
   

NoteIf you don't see the list of display languages, you need to install additional language files first. For more information, see Install a display language.
When you change the display language, the text in menus and dialog boxes for some programs might not be in the language that you want. This happens because the program might not support Unicode. For more information about changing the text in menus and dialog boxes for programs that do not support Unicode, see Change the system locale.

try this language pack from microsoft >> http://support.microsoft.com/kb/925471 hope this helps

Step 1. Download a spanish Language pack here.


Step 2: Call Microsoft's hotline: 1-866-234-6020

Step 3: Ask for: Step-by-step on how to install a Spanish Language pack.