EULAs will hold up in court, they are legal binding contracts for all users of a particular computer (running that software). They include an option to allow you to disagree with them, as each EULA will include a phrase similar to:
"If you do not, or cannot, agree to this EULA the please return this software to the vendor for full reimbursement."
If you get the software, read the EULA and decide you don't like it you can return it. Otherwise the company can specify anything they like in that EULA and you are agreeing to it. You cannot "accidentally" install the software as the next button does not work until you have agreed in the installer (unless you have a hacked installer!).
Software companies sell you one "license" to use their software when you buy a CD (though this is never explicitly stated on the outside of the box). This means that you do not actually own the software and so really have no rights concerning it (its like buying the right to eat 1 ice cream, the vender does not need to support Ice Creams or give you advice eating ice cream etc...)
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