Starting off - javac not recognized

ok firstly im a newb, 1st day learning java in uni.
we made that "Hello World!" thing at uni and id thought id try it out at home
ive done everything and when i go to compile my .java file with javac it says 'javac not recognized'
i then realised i haven't got java installed, so i downloaded and installed
the Java SE Development Kit 6 Update 5
Download Now! Windows Offline Installation, Multi-language jdk-6u5-windows-i586-p.exe 71.39 MB
so i restarted my PC and then tried it again, again javac doesn't seem to work
have i downloaded the wrong installation? if so which one should i have downloaded
i have XP and Vista 32bit a PC and a laptop
thanks

Maybe you forgot to add the bin folder in the class path....
Right-click My Computer, got to Properties....
Click the Advanced tab, Click Environment Variables....
Under the System Variables,
Click path and edit.
For example, i have
%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbe
You can add the jdk bin folder path... Just put a semicolon before Wbe
For example, you installed the jdk @ D:\Program Files\Java\jdk1.6.0_03\bin...
Now you have
%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbe;D:\Program Files\Java\jdk1.6.0_03\bin
Save and done....
Update us if you still have a problem about it....
kind regards,
sukatoa

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Hi!
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#echo "PowerButton pressed!">/dev/tty5
case "$2" in
PBTN|PWRF) logger "PowerButton pressed: $2" ;;
*) logger "ACPI action undefined: $2" ;;
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button/sleep)
case "$2" in
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AC*|ACAD*|ADP0*|AD*)
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00000000)
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echo -n $minspeed >$setspeed2
echo -n $minspeed >$setspeed3
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00000001)
echo -n $maxspeed >$setspeed1
echo -n $maxspeed >$setspeed2
echo -n $maxspeed >$setspeed3
echo -n $maxspeed >$setspeed4
#/etc/laptop-mode/laptop-mode stop
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*) logger "ACPI action undefined: $2" ;;
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BAT0)
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ac_adapter)
case "$2" in
AC*|ACAD*|ADP0*|AD*)
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Good Morning Everybody!
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