My thought was that Windows 7 should be more secure, because it has the latest anti-malware programs. I’m not sure how true that is. My Windows XP has been the victim of several attacks, even with malwarebytes and avast. I thought that hackers would leave older systems alone, but that hasn’t been the case in my experience. Maybe I should go back to Windows 95. What hacker would care enough to go after a really old OS?
Windows 7 fails just about every functional test I could give it.
I got more spam and viruses with it than I ever got with XP (I use Norton 360) and windows 7 leaked like a sieve.
“I’m really leaning towards buying the XP SP3”
SP3 might have the bugs worked out by now, but when I ran the Windows Update from SP2 to SP3, my PC crashed. After a couple hours with tech support (I’d purchased Dell tech support with my system), I took the system back to virgin state, reinstalled all programs, and lost all files that hadn’t been backed up. I turned off Automatic Updates, and avoid SP3 like the plague. (The techie said this was a huge problem, as did several online discussions.)
Anyhow, FWIW...
For the extra 40 bucks, A Win7/64 Home will probably do all you want it to. And it is the 64bit (if you're box can handle it) that make Vista/Seven so superior to XP (whose 64bit version was always hinky.) But even the 32bit Seven is preferable to XP... If not for the eye-candy and superior graphics, even if only for the repairs to known exploits it is worth the upgrade. But it is 64bit that you should be shooting for - It is 64bit that allows you to access ALL of the computing power possible in modern processors, and that gives you an ability to manage enormous quantities of RAM memory (32bit systems can only handle 3g).
As far as security is concerned, I would say that Seven is a bit better than XP - Again, many known exploits in XP era subsystems has been tightened up in Vista/Seven. UAC provides a basic block to older viruses (albeit that newer viruses go right through it), and the Win7 firewall is more manageable.