If you just want to change the keyboard and general language settings, you simply go to the Start Menu -> Control Panel -> Regional/Language settings and change your language.
If your friend installed the Turkish version of WinXP (i.E. all the alert boxes are in Turkish) and you want to modify it to another language - that's a totally different and more complex situation.
In order to change the whole system language you can install a newer service pack in a different Language or uninstall the last installed Service Pack and after changing the registry settings below Install it again.
!!!Make always a backup of your Registry first !
You have XP SP2 in Turkish and want to change your systmes language to English, you will have to download SP3 in English (
link).
(You can change the language here to another one before the download.)
Then you will have to change some registry keys. (Go to HKEY_LOCAL_MACHINESYSTEMControlSet001ControlNlsLanguage Registry Key), and change the value for “Default” and “InstallLanguage” from 041F (Turkish) to 0409 (English).
Reboot and you'll be able to install SP3 in English.
If no problems occur, you will have the whole system language changed.
Here is the List of numbers that represents each language in the registry:
* 0436 = "af;Afrikaans"
* 041C = "sq;Albanian"
* 0001 = "ar;Arabic"
* 0401 = "ar-sa;Arabic (Saudi Arabia)"
* 0801 = "ar-iq;Arabic (Iraq)"
* 0C01 = "ar-eg;Arabic (Egypt)"
* 1001 = "ar-ly;Arabic (Libya)"
* 1401 = "ar-dz;Arabic (Algeria)"
* 1801 = "ar-ma;Arabic (Morocco)"
* 1C01 = "ar-tn;Arabic (Tunisia)"
* 2001 = "ar-om;Arabic (Oman)"
* 2401 = "ar-ye;Arabic (Yemen)"
* 2801 = "ar-sy;Arabic (Syria)"
* 2C01 = "ar-jo;Arabic (Jordan)"
* 3001 = "ar-lb;Arabic (Lebanon)"
* 3401 = "ar-kw;Arabic (Kuwait)"
* 3801 = "ar-ae;Arabic (you.A.E.)"
* 3C01 = "ar-bh;Arabic (Bahrain)"
* 4001 = "ar-qa;Arabic (Qatar)"
* 042D = "eu;Basque"
* 0402 = "bg;Bulgarian"
* 0423 = "be;Belarusian"
* 0403 = "ca;Catalan"
* 0004 = "zh;Chinese"
* 0404 = "zh-tw;Chinese (Taiwan)"
* 0804 = "zh-cn;Chinese (China)"
* 0C04 = "zh-hk;Chinese (Hong Kong SAR)"
* 1004 = "zh-sg;Chinese (Singapore)"
* 041A = "hr;Croatian"
* 0405 = "cs;Czech"
* 0406 = "the;Danish"
* 0413 = "nl;Dutch (Netherlands)"
* 0813 = "nl-be;Dutch (Belgium)"
* 0009 = "en;English"
* 0409 = "en-us;English (United States)"
* 0809 = "en-gb;English (United Kingdom)"
* 0C09 = "en-au;English (Australia)"
* 1009 = "en-ca;English (Canada)"
* 1409 = "en-nz;English (New Zealand)"
* 1809 = "en-ie;English (Ireland)"
* 1C09 = "en-za;English (South Africa)"
* 2009 = "en-jm;English (Jamaica)"
* 2809 = "en-bz;English (Belize)"
* 2C09 = "en-tt;English (Trinidad)"
* 0425 = "et;Estonian"
* 0438 = "fo;Faeroese"
* 0429 = "fa;Farsi"
* 040B = "fi;Finnish"
* 040C = "fr;French (France)"
* 080C = "fr-be;French (Belgium)"
* 0C0C = "fr-ca;French (Canada)"
* 100C = "fr-ch;French (Switzerland)"
* 140C = "fr-lu;French (Luxembourg)"
* 043C = "gd;Gaelic"
* 0407 = "de;German (Germany)"
* 0807 = "de-ch;German (Switzerland)"
* 0C07 = "de-at;German (Austria)"
* 1007 = "de-lu;German (Luxembourg)"
* 1407 = "de-li;German (Liechtenstein)"
* 0408 = "el;Greek"
* 040D = "he;Hebrew"
* 0439 = "hi;Hindi"
* 040E = "hu;Hungarian"
* 040F = "is;Icelandic"
* 0421 = "in;Indonesian"
* 0410 = "it;Italian (Italy)"
* 0810 = "it-ch;Italian (Switzerland)"
* 0411 = "ja;Japanese"
* 0412 = "ko;Korean"
* 0426 = "lv;Latvian"
* 0427 = "lt;Lithuanian"
* 042F = "mk;FYRO Macedonian"
* 043E = "ms;Malay (Malaysia)"
* 043A = "mt;Maltese" 0414 = "no;Norwegian (Bokmal)"
* 0814 = "no;Norwegian (Nynorsk)"
* 0415 = "pl;Polish"
* 0416 = "pt-br;Portuguese (Brazil)"
* 0816 = "pt;Portuguese (Portugal)"
* 0417 = "rm;Rhaeto-Romanic"
* 0418 = "ro;Romanian"
* 0818 = "ro-mo;Romanian (Moldova)"
* 0419 = "ru;Russian"
* 0819 = "ru-mo;Russian (Moldova)"
* 0C1A = "sr;Serbian (Cyrillic)"
* 081A = "sr;Serbian (Latin)"
* 041B = "sk;Slovak"
* 0424 = "sl;Slovenian"
* 042E = "sb;Sorbian"
* 040A = "es;Spanish (Traditional Sort)"
* 080A = "es-mx;Spanish (Mexico)"
* 0C0A = "es;Spanish (International Sort)"
* 100A = "es-gt;Spanish (Guatemala)"
* 140A = "es-cr;Spanish (Costa Rica)"
* 180A = "es-pa;Spanish (Panama)"
* 1C0A = "es-do;Spanish (Dominican Republic)"
* 200A = "es-ve;Spanish (Venezuela)"
* 240A = "es-co;Spanish (Colombia)"
* 280A = "es-pe;Spanish (Peru)"
* 2C0A = "es-ar;Spanish (Argentina)"
* 300A = "es-ec;Spanish (Ecuador)"
* 340A = "es-cl;Spanish (Chile)"
* 380A = "es-uy;Spanish (Uruguay)"
* 3C0A = "es-py;Spanish (Paraguay)"
* 400A = "es-bo;Spanish (Bolivia)"
* 440A = "es-sv;Spanish (El Salvador)"
* 480A = "es-hn;Spanish (Honduras)"
* 4C0A = "es-ni;Spanish (Nicaragua)"
* 500A = "es-pr;Spanish (Puerto Rico)"
* 0430 = "sx;Sutu"
* 041D = "sv;Swedish"
* 081D = "sv-fi;Swedish (Finland)"
* 041E = "th;Thai"
* 0431 = "ts;Tsonga"
* 0432 = "tn;Tswana"
* 041F = "tr;Turkish"
* 0422 = "uk;Ukrainian"
* 0420 = "your;Urdu"
* 042A = "vi;Vietnamese"
* 0434 = "xh;Xhosa"
* 043D = "ji;Yiddish"
* 0435 = "zu;Zulu"
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