It depends on where the error came from. I doubt Mcafee really requires over 256Mb. Generally, if Windows will run in it (whatever RAM you have) the applications will to (even though if you are short (like 256Mb or below), performance will be very poor), but a clean Windows XP install will run fine with just 256Mb for most tasks.
If you already have a malware(s) or virus on your PC, it may detect that you are trying to install an antivirus and be giving you a bogus error as it interrupts the install.
OR, if you already have a malware or virus, it may simply be sucking down so much memory that after being up a while, you've run out free virtual memory (Windows "scratch pad" that it needs in order to run).
If you are familiar with msconfig, try turning off all unecessary items in the startup list, reboot, and try reinstalling Mcafee very first thing.
Also, if you think your PC is already infected, you might try downloading and running malwarebytes. It targets certain common malware and can remove a lot of them. It isn't a general antivirus solution. Then try rebooting and reinstalling Mcafee again.
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