Viva Pinata DS Rom Not Working!

I just downloaded the Viva Pinata DS Rom, extracted using WinRar and put it on my R4 card, only to load the game and discover it says: "Cannot access data. Turn off power and reinsert game card." Now I've really been looking forward to this coming out, right from the first rumours. I used to play it on the Xbox at my boyfriends and I miss it!
Can anyone help? Please?Some of my R4 specs:SanDisk 2 GB MicroSD card.
It's v1.10.A few other games have done this to me as well, but none that I'm bothered about as much as this one!Can anyone help? Pretty please :)

update your firmware.

I'm guessing firmware is the version, yes?
This won't affect my other games then?

Yes the version. Get it from http://www.linfoxdomain.com/ds/. No it won't affect your other games.

ive tried to extract the file into my DS LINKER but there seems to be a problem other members also have the same problem

Extract the firmware files from the archive .zip or .rar etc., then put those files straight onto your card and overwrite the previous files.