EDIT:
Mitch, completely disregard all the gibberish that Timbuck put in his/her answer.
Yes, it's true that you can access, copy and delete Windows system files in Ubuntu, but you don't want that, you just want to remove the virus infection without deleting any Windows system files.
Read bellow for the best and safest way to do that.
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First of all, Norton sucks. Together with McAfee they are the worst protection you can have. get rid of Norton as soon as you can.
For now, do this to get rid of whatever bug screws with your computer as well as your nerves:
For a proper scan and removal of any virus, worm, trojan and any other malware, the best way is to use a System Rescue CD, like BitDefender or Kaspersky. Those are both bootable CDs, that run scans in a safe Linux environment, not corrupted by anything.
Go to a different, healthy, non-infected PC or laptop and download both the BitDefender and the Kaspersky Anti-virus Recovery CDs (free downloads).
Download links for both:
http://download.bitdefender.com/rescue_cd/
http://support.kaspersky.com/viruses/rescuedisk
Burn both downloaded ISO files to CD with an ISO burner software. If you do not have an iso burning software installed, I recommend getting the CDBurnerXP (free software) from here:
http://cdburnerxp.se/
Or just use this little utility to write the .ISO to a CD:
http://www.hiren.info/download/freeware-tools/BurnCDCC.zip
Just download, unzip and run the BURNCDCC.EXE, no installation is necessary.
Once you burned the recovery CDs, return to the infected computer and put the BitDefender Anti-virus Recovery CD in your CD/DVD drive and boot from CD (set your boot up options in BIOS to CD boot as first option if it does not boot from CD at first)
After your infected computer boots into the Recovery CD Linux environment, first update the virus definition database from the Internet server, than perform a complete scan of your desktop computer or laptop (all hard drives and/or partitions). Remove (delete) any infections found, and shut down your desktop computer or laptop.
Remove the BitDefender Anti-virus Recovery CD and insert the Kaspersky Anti-virus Recovery CD.
Repeat the same procedure as for BitDefender above.
After scanning with those 2 Anti-virus Recovery CDs, your system should be virus free, and will function properly again.
For the future:
Best pay antivirus programs are BitDefender or ESET Nod32.
The best free antivirus programs are Avast Free and Avira AntiVir Free.
http://download.cnet.com/Avast-Free-Antivirus/3000-2239_4-10019223.html?part=dl-85737&subj=dl&tag=button
http://www.avira.com/en/free-download-avira-free-antivirus/x-origin/web
Install 2 antivirus programs, one to run at all times as live, active protection scanner, and another just for on demand scans when you have doubts about any file.
You will need to disable the secondary antivirus from start up menu via 'msconfig' command, as only one live protection antivirus at a time can run in a Windows system. The secondary antivirus is only to be used for on demand scan of files, as a back up and confirm solution for any dubious files.
Also install MalwareBytes, at least the free version (offers added protection against malware, spyware, adware and rootkits, also against some viruses and Trojans).
http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html?part=dl-10804572&subj=dl&tag=button
Microsoft Windows Firewall sucks.
You will also need a good Firewall to protect your system from attacks.
Install Zone Alarm or Comodo Firewall (both are free). Zone Alarm is by far the best firewall.
http://www.zonealarm.com/security/en-us/trialpay-za-signup.htm
Install CCleaner to clean your registry keys and other unwanted stuff.
http://www.piriform.com/ccleaner/download/standard
For your web browser, use either Firefox Mozilla, Google Chrome or Opera.
DO NOT USE INTERNET EXPLORER (IE), as it is the worst browser, and it can be easily attacked, infected and corrupted.
Also install the WOT (Web of Trust) addon tool to all your browsers. It rates all websites, blocks access and also alerts you when you open an unsafe website, thus preventing any internet attack or virus infection.
http://www.mywot.com/
For media players:
Use either WinAmp, Songbird or Media Jukebox for audio files. DO NOT use iTunes, that Apple (Mac) crap sucks even more than any Microsoft crap.
Use either VLC Media Player or GOM Player for video files and DVD. Both of them would play anything without the need of any codecs, even damaged and incomplete video files.
Other options would be (in this order) Daum PotPlayer, KMPlayer, Kantaris Media Player, SPlayer, SMPlayer, and MPlayer. All are free to download and use.
Good luck.