For your antivirus and anti spyware, its safe.
Just for you to know (All freeware):
Anti-spyware, currently well-known: Ad-aware, Spybot - Search &
Destroy and Window Defender.
Firewall, currently best free: ZoneAlarm free version.
Anti-virus, Currently well-known: AVG free version and AntiVir
Personal Edition Classic.
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I would suggest use a up-to-date firewall. I don't think symantec
is giving any more support to 2004 version. Use ZoneAlarm
instead.
Would suggest you getting 2 anti-spyware program instead because
some anti-spyware program can't detect certain spywares found in
your computer. So getting 2 would compensate this problems. Suggest
using Spybot and Window Defender*.
Note: I assume you are using legal version of windows, if not, you
can't use window defender.
ZoneAlarm Free -
http://www.zonelabs.com/store/content/company/products/znalm/freeDownload.jsp
Other than that, your PC is fine.