help please

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Ok so i know this part of the forum is only for pocket pcs but I think its ok to post this here. So whenever I try installing a freeware program on the Samsung Ace i get the message, "installation was unsuccessful. the program or setting cannot be installed because it does not have sufficient system permissions."

Is there some setting I need to change or what? Thanks for your help. And now my brother knows why I told him to get a touch or mogul over the Ace haha :)