Can't boot from OSX and may have a virus

I'm having a similar problem as Davo21 in "computer won't boot up in os x". After running Norton System Works to try to resolve an issue that I was having with my computer, I'm getting a message, "/etc/master.passwd:not a directory" on a black screen when I try to start up.
It started in early December after I downloaded some stuff off the internet and it seemed like I might have picked up a virus. I know, that's not supposed to happen with OSX, but my computer started doing wierd things like switching out icons for whole types of files - i.e., .wav files would show up with a totally different icon. Restarting solved that problem, but I noticed that on both my wife's and my computer (both Macs - hers a Single core Intel Mini running OSX 10.4 and mine a G3 700MHz running 10.3.9) the internet was running exceptionally slow, while on my work computer (a Dell PC running Windows XP) it was running just fine. All three computers are networked, so I surmised that something was affecting the Unix system but not the Windows, but when I ran Norton Anti-virus, it came up clean. More wierd things kept happening, so last week I decided to run Norton Disk Doctor and it changed thousands of directory settings and now my computer won't boot up from my main boot drive with OSX 10.3.9. I've run the Disk Utilities on the 10.3 Install Disk and I've run Disk Warrior and they both say that the boot drive is repaired, but I still get the same message when I try to start up normally.
I have several partitions on my original drive and several more on the additional 240GB hard drive that I installed a couple of years ago, so I can boot up from an old copy of OSX 10.2 on another partition. The latest wierd thing is that now one of my other partitions on the original hard drive won't mount.
My questions are:
1) How do I get back to being able to boot from OSX 10.3?
2) Where can I get help to figure out what's going on with my computer and how to remedy it?
I've been looking at some of the information on the Leap-A malware and it seems like there are some similarities, however I'm running OSX 10.3.9 and not 10.4.
Any suggestions would be appreciated.
Thanks,
G4 700MHz   Mac OS X (10.3.9)  
G4 700MHz   Mac OS X (10.3.9)  

DMcSantaFe,
as was said before Norton Utilities and Disk Doctor were discontinued almost 3 years ago (for some very good reasons!). It caused much more trouble than it solved.
Here are the articles:
Symantec discontinues Mac Norton Utilities, SystemWorks
Norton Utilities, SystemWorks development halted
TMO Scoop - Symantec Confirms Norton Utilities & SystemWorks' Demise [Updated]
Tech Tool Pro and DiskWarrior are presently the most reliable utilities. For more information on regular housekeeping read this: MacOS X 10.3/10.4: System maintenance
Unfortunately Norton usually damages the file system beyond repair. The only cure is a reinstall.
If this answered your question please consider granting some stars: Why reward points?

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