Any of the major name brand Antvirus programs by themselves, and their associated multi-threat suites - are fine. None are perfect; its good to have a backup, a "second Opinion" option - but bear in mind you generally don't want 2 different antivirus programs running real-time at once. While it can be done (but generally not without some fairly geeky fiddling and twiddling), there is little good reason to do so, plenty of good reason to not do so, and in any event, many antivirus programs won't install if they detect an already-installed antivirus from another vendor. Antispyware/Adware programs are another matter; generally it is fine to have more than one installed - in fact, that's recommended - though only one should be configured for active, real-time protection.
The thing about multi-threat suites is that their assorted components are, at least in theory, designed to play well together "right outta the box", something which can be very desirable for folks who really aren't fond of fiddling and twiddling. There is also the fact that a single renewall fee can be very convenient - a consideration as well.
Before deciding on any of them, in whatever configuration cand combination, do your homework, read plenty of reviews (and know that professional reviews - editors' reviews and the like - very most typically are far more objective, informative, and accurate than are user reviews - an overwhelming proportion of negative user reviews - for damned near anything, not just software - stem directly from not having read the manual. Beware also of phony review websites that hawk little-known software, usually with some sort of claim along the lines of "Proved by test to be the best! (See Colorful Chart) Hurry, Limited Time Special Offer EXPIRES AT MIDNIGHT; CLICK HERE TO DOWNLOAD
NOW!!!"
And yeah, a slow dialup can be a problem ... but I'm pretty sure you mean "17.4Kbps" - not 17.4MB - that'd be hella fast; I'm only on 3MBps (which, while about as fast as DSL gets, often seems pokey to me - I'm spoiled
).