This is an automated version of the codepage changing instructions in snippet 414 ( http://codesnippets.joyent.com/posts/show/414 ). Be sure to read the comments on that snippet for the potential hazards of changing codepage settings.

Save the code as a .bat file and run without parameters for usage instructions.

@echo off
::GOTOs are considered harmful, so I'm a mean, dirty killer ;)
:: Seriously though, I should've used "CALL" and "GOTO :EOF"

REM Read switches

if X%1 == X-view (
  goto ViewCP
)

if X%1 == X-edit (
  goto EditCP
)

REM Catchall: show switch options
goto Usage

:::::::
:ViewCP
REM echo active codepage
chcp
REM echo default codepage:
For /F "Tokens=1,2,3 Delims=	" %%A In ('reg query HKLM\SYSTEM\CurrentControlSet\Control\Nls\CodePage /v OEMCP ^|findstr OEMCP 

') do @echo Current default codepage: %%C
goto Exit

:::::::
:EditCP
REM Check that a codepage value has been provided
if X%2 == X (
  goto NoParam
) ELSE (
  goto Param  
)

:Param
echo Changing active and default codepages to: %2
echo (usually requires admin rights)
echo.
chcp %2 >nul
reg add HKLM\SYSTEM\CurrentControlSet\Control\Nls\CodePage /v OEMCP /t REG_SZ /d %2 /f >nul
goto ViewCP
goto Exit

:NoParam
echo ERROR: You must specify a codepage value, e.g. 1252 when using the -edit switch
goto Exit

::::::
:Usage
echo.
echo CodePageChanger Usage
echo.
echo %0 -view
echo %0 -edit CODEPAGENUMBER
echo.
echo (English WinXP default: 850, WinLatin1: 1252)
echo.

:Exit

This code snippet should be saved as a batch file and run in Windows. It can be set up as a scheduled task to log response times at a fixed interval. It takes one argument, the URL, which should be enclosed in quotes or Windows will barf on URLs with = (equals) signs in. If you don't supply any arguments, you will be prompted. Binary versions of curl are available via google.

If you have ISA:

REM measure response times for a site:
@echo off
IF a%1 == a (
  SET /P varHost=Enter the address, e.g. http://google.com: 
) ELSE (
  SET varHost=%1
)
SET startTime=%date% %time%
curl.exe --proxy-ntlm --proxy yourISAproxy:8080 --proxy-user username:password -s %varHost% > fulloutput.txt
echo %startTime%,%date% %time%,%varHost% >> respTimeLog.txt

If you have no proxy:

REM measure response times for a site:
@echo off
IF a%1 == a (
  SET /P varHost=Enter the address, e.g. http://google.com: 
) ELSE (
  SET varHost=%1
)
SET startTime=%date% %time%
curl -s %varHost% > fulloutput.txt
echo %startTime%,%date% %time%,%varHost% >> respTimeLog.txt