Hi,
PC-cillin is highly effective. It has been consistent in it's ability to detect viruses. However, it, like most av programs, has its quirks. It does not play well with all systems and makes this evident the moment it's installed. This is not because it's a bad program. This excerpt from an earlier thread will explain:
".....In recent months, users have seen definition updates in a variety of well known antivirus programs cause a multitude of system glitches, from system slowdowns to application and operating software errors, and system failures. This is because antivirus programs and their detection methods work on a low level basis out of necessity, interacting with all of the most important, or crucial parts of a system. Because of this, it's not uncommon for these areas to become inaccessible or damaged. Only after the software is released to the public are vendors really sure if there are going to be problems or not, and the time frame that involves this process can extend for weeks....."
Fortunately, this is fairly uncommon and you should have no problems with it. I also recommend Sophos antivirus. You'll find links for these in
THIS thread along with tons of other programs and utilities.
As far as a firewall is concerned, most regular users will find that ZoneAlarm or Outpost will work very well for them with a minimal amount of effort and maintainance. I would rather new users do a little bit of work and become accustomed to using Outpost because of it's advanced configuration potential. This is in case you find you enjoy learning how to create your own rules for the program without it leaving your system unguarded while you go thru the learning process. These are also located in the aforementioned link.
Ed is correct. MailWasher is prolly the easiest and fastest way for you to get a handle on spam. I would use it.