I think I may have a virus on my MacBook laptop, ran disk utility, "filesystem verify failed." Help!

I'm running a MacBook laptop and thought I might have a virus b/c i was browsing online a couple of days ago when i clicked on a link that appeared to automatically start downloading a file. I tried to stop it from downloading by clicking "cancel" in the downloads box that came up, but it compleatly downloaded before i could hit cancel. No programs automatically opened and started runnning (that i could see), but I've noticed slow browsing since then.
I ran the disk utility, "verify disk," to see if there were any problems. It came back with this error message: "First aid failed: Disk Utility stopped verifying "Macintosh HD" because the following error was encountered:
Filesystem verify or repair failed"
The text is black inside the verifying history box until the last three lines, which say in red:
"Invalid node structure
Volume check failed
Error: Filesystem verify or repair failed."
Does this mean I have a virus? Are there other things I can do to confirm that I do or do not have a virus? How do I fix this problem?
I'm running Mac OS X 10.5.8.
Many thanks for your advice/comments in advance.

Probably because the directory on the disk is corrupt.
The error "invalid node structure" is one that will take either DiskWarrior or a reformat to fix.
It has not to with any malware.
Allan

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