EULA's aren't worth the disk-space they take up, several Trading Standards-like agencies have told companies this several times, the law isn't what you say it is, you cannot say 'By clicking this button you are agreeing to our terms', considering you have already paid however much for the right to use that software, the moment the money exchanged hands, you both became subject to the trading standards of whichever coutry you are in.
It is at the point of exchange that the agreement is made, not after they've got your money, no agreement signed under Duress (which is what it effectively adds up to) is binding.
And if the EULA says it installs software, which is not vital to the product, and you cannot stop the installation, are, strictly speaking, breaking the law by placing unsolicited content on your computer, which falls under the new anti-spam rules.