ANTIVIRUS, I'll give you some good advice. Norton is distributed free with a lot of new computers these days, they called it 'bundled' software. Your Norton will expire after 6 or 12 months, but it can be updated via the net as per other posts.
TIP: Norton is not very good, all Norton products interfere with the running of a PC.
The majority of features offered by Norton are in a lot of cases already imbedded in a Win98/Win2000 systems, it's just a matter of reading the book or learning how to use/find them. (No insult intended)
Use 'VET' for anti virus protection, it's simply the best and has an auto update feature, available online, its cheap if you don't order the CD version, check them out at
www.vet.com.au
Never received a single virus in six years!!
Best wishes