The wheels on my RC car go without any radio control...?

I bought my little Drift King about 2-3 years ago for about $70.00, but I didn’t get to play with it that much, for some reason with the battery fully charged and the batteries in the radio fully charged when I turn on the car the wheels just start going at full speed, for some reason it seems like the “go” button is always on….

This is the car I have to give you a better perspective

http://www.walmart.com/catalog/detail.gs...

I’ve tried everything I could think of but I just can’t get the car to perform again, if I put it down it just goes straight, I have to put the radio control into reverse to slow it down so I can chase after it and turn it off, does anyone here know what the problem is and if it’s something I can fix? There are a few hobby shops around my area that may be able to fix it but we all know how expensive that can be so I thought I’d try here first, I’ d really appreciate any help I can get.

Thanks as always,