Besides the software you have purchased, I can add some additional free software that will enhance your computer use.
Google toolbar: This is a very useful addition to Internet Explorer (or Firefox). It adds a popup blocker, a web form spell checker (when you are filling out something on a web page), Autolink which searches a web page for addresses and then if you click on them you go to Google map. There are many other tools you can add yourself. There is an autofill feature which IS NOT turned on for privacy reasons, but you can store info here that will be automatically entered on web pages as needed.
Google desktop: This very useful program will index files on your computer (some versions of Vista already have this) so you can do a search for something you saved in the past. It indexes the content of the document so if you wrote a letter, or e-mail that contained some unique information, you can find that document by searching on its contents not just trying to remember the file name. Big caveat: anything you write will be contained in a file somewhere on your hard drive and “maybe” at Google???
AVG Anti-virus: Self-explanatory, check out the info on their web site.
TrueCrypt: This program creates an encrypted, password protected volume on your hard drive that allows you to store any type of file there making it nearly impossible for someone else to open or view.
McAfee SiteAdvisor: This browser add-on provides you with a green/yellow/red signal about most web sites you visit. It also shows the same signal on most search helping you decide before you go to a site.
Sandboxie: This program creates something called a sandbox. This is like a virtual machine where all the activity between your machine and the Internet happens in the "sandbox" so if something bad is downloaded, it can only play within the sandbox and doesn't get into your real computer.
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While these programs are given away free, their authors may occasionally interrupt your use of the asking for a donation. If you think you are getting value from them, think about donating.
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Windows Vista contains additional security. Check it out and decide for yourself how to implement it.
What is UAC and do you want to use it???
You can go to Paul Thurrott's SuperSite for Windows and read about it. I think it is worth the extra effort for this protection.