Do I have a virus? Please help

Thank you! to anybody willing to read this and help me out, I am not nearly skilled enough to figure this out myself. Sorry if I wrote more info than necessary, just want to be thorough.

I am running Windows XP with Norton Internet Security (firewall and automatic liveupdates) on a Dell desktop Pentium 4 with a cable modem connection. I use Internet Explorer.

I was closing down my applications today when I found a message from Norton saying that it had found a virus named bloodhound, but it said it could not access the file. I closed the message and ran a complete virus scan after live update and found nothing.

Then I went to look at Norton's log viewer and found some things like this:

ALERTS: I found a LONG list of these stating "Unauthorized access logged" which seemed to be coming a few times a day in batches of about 6-20 hits within a minute. They all say "unauthorized access stopped". The actor and target were not always the same. For example:

Actor: C:\WINDOWS\system32\lsass.exe (PID=756)
Target: C:\Program Files\Common Files\Symantec Shared\ccApp.exe

Actor:C:\WINDOWS\system32\winlogon.exe (PID=700)
Target: C:\Program Files\Common Files\Symantec Shared\ccSetMgr.exe
Target: C:\Program Files\Norton Internet Security\Norton AntiVirus\navapsvc.exe

There are more, but I'm not going to post all of them.

In the FIREWALL section I've got a ton of these messages:

Unused port blocking has blocked communications. Inbound TCP connection.

An instance of "C:\WINDOWS\system32\lsass.exe" is preparing to access the Internet

An instance of "C:\Program Files\Norton Internet Security\Norton AntiVirus\navw32.exe" is preparing to access the Internet.

In the SECURITY RISKS section I've got these three messages:

Source: C:\Documents and Settings\Jeremy\Local Settings\Temporary Internet Files\Content.IE5\W14X6RS9\wmf_dcode[1].wmf
Click for more information about this risk : Bloodhound.Exploit.56
Action taken: Repair failed
Action taken: Access denied

Source: Manual Scanner
Risk category: Adware
Click for more information about this risk : Adware.180Search
Action taken: Removed

Source: C:\Documents and Settings\Jeremy\Local Settings\Temporary Internet Files\Content.IE5\MXW5UXCT\bridge-c8[1].cab
Risk category: Adware
Click for more information about this risk : Adware.180Search
Action taken: Detected

All the other messages in other categories seem pretty standard to me.

Other facts:

My windows security is up to date

Not sure if it is relevant, but when I first got my computer I was constantly getting a message from Norton saying that some Win32 program was trying to make a connection and I kept manually blocking it, but it would pop up every 5 minutes and when I permanently blocked it, I could no longer connect to the internet. So my firewall has since been permitted to always use Microsoft Generic Host Process for Win32. Not that I know what that means.

I am always running msconfig to shut down the automatic startup of anything I don't recognize.

I often delete all cookies and temporary internet files.

I have a few programs with access in my firewall configuration that I don't recognize such as "aswapp" "GLBA4," "GLBBD, "GLBC8," and "Active Worlds AutoUpdate Utility."

My firewall level is set on High and my Internet Explorer security is set to some custom level that I believe was created when I loaded Norton onto my computer.

That's it. Thanks!