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Do you mean can you install the same mcafee product on multiple computers, with just one email address? If so, then that depends on the plan you have. Normally mcafee allows 3 installs.. But it could be more or less depending on the exact service / plan you paid for.
If you are eligible to install on multiple devices, then you do not need multiple email addresses. You can use your one email address / mcafee account to install on as many devices as your subscription will allow.
I hope that answers your question, and if you get stuck or need further assistance you are welcome to reply.
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Things with mcafee work a bit differently nowadays.. And your welcome to use an en tirely different email address since you no longer have access to the old one.
For instance, if you purchase this version of mcafee total security, http://amzn.to/29oldRK You can install it on unlimited devices. As many computers, macs, iphones or android phones that you want. ( but I suggest installing it on your vista machine first so you can setup the new account )
Once you purchase , you will receive a online code you can use.. On the page that gives you the online code, it will show you a download link. Mcafee downloads in 64 bit, as the vast majority of machines are now 64 bit.
If you encounter any issues downloading or installing mcafee on your vista machine, let me know. If needed I can guide you through the install or I can connect to your machine from here, and install it for you.