Batch script not running

can you help me please?

This piece of script is not running and i can't figure why.

@echo off
ver | findstr /i "5\.1\."
if %ERRORLEVEL% EQU 0 (
    set os_ver="xp"
)

ver | findstr /i "6\.1\." > nul
if %ERRORLEVEL% EQU 0 (
    set os_ver="7"
)

if %os_ver% == "xp" (
    set os_bits="32"
)

if %os_ver% == "7" (
    if %PROCESSOR_ARCHITECTURE% == "x86" (
        set os_bits="32"
    ) else (
        set os_bits="64"
    )
    echo %os_bits%
)
pause

it doesn't echo anything despite "ECHO IS DEACTIVATED" or "ECHO IS ACTIVATED"

update: I posted the entire code, beacause people are saying that it is working

Update2: I'm on a Windows 7 64 bits