Uhm, you might want to take that picture out ASAP...it's kinda stupid posting your CD key on the web for everyone to misuse it.
If you want to change your key, just open the regedit and go to
32bit: HKEY_LOCAL_MACHINE\SOFTWARE\Electronic Arts\EA GAMES\Battlefield 1942\ergc
64bit: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Electronic Arts\EA Games\Battlefield 1942\ergc
There the (Standard) entry contains your serial. Just type it in without any "-".
Umm.....A CD Key hash is different from your actual CD Key. I did the liberty of editing your post with the cd key censored. This is for your own safety.
CD Key hash is something the server calculates from your CD key and isn't something that can be reverse engineered back to a CD Key and thus key hashes can be posted safely. HOWEVER! That program does not change key hashes, it changes your CD Key! Thus it is a bad idea to post those numbers in a public forum!
EDIT:
...And now just read that you "made up" the numbers.......umm....yeah.....This thread will be locked because no useful discussion will come from this. fo0k has already told you why.