How do I uninstall the firefox 16 update from my computer? it won't allow my antivirus to scan for viruses and spyware!!

when I installed this update it said that it was not compatible with my Norton toolbar, which I didn't think would be a problem. now I've got malware ads popping up on different websites and when I scan my computer for viruses/spyware, it always says there is no risks. I find that hard to believe. I just want to uninstall the last update (Firefox 16).

You posted here with Firefox 17.0.1.
Try running a Norton Live Update so Norton can update their Firefox add-on and get that Toolbar working again.
That said, Norton doesn't do anything about Malware. You need a Malware application to locate and remove Malware.
Install, update, and run these programs in this order. They are listed in order of efficacy. '''''(Not all programs detect the same Malware, so you may need to run them all to solve your problem.)''''' These programs are all free for personal use, but some have limited functionality in the "free mode" - but those are features you really don't need to find and remove the problem that you have. 
''Note: If your Malware infection is bad enough and you are mis-directed to URL's other than what is posted, you may have to use a different PC to download these programs and use a USB stick to transfer them to the afflicted PC.''
Malwarebytes' Anti-Malware - [http://www.malwarebytes.org/mbam.php] 
SuperAntispyware - [http://www.superantispyware.com/] 
AdAware - [http://www.lavasoftusa.com/software/adaware/] 
Spybot Search & Destroy - [http://www.safer-networking.org/en/index.html] 
Windows Defender: Home Page - [http://windows.microsoft.com/en-US/windows7/products/features/windows-defender] 
Also, if you have a search engine re-direct problem, see this: 
http://deletemalware.blogspot.com/2010/02/remove-google-redirect-virus.html
If these don't find it or can't clear it, post in one of these forums for specialized malware removal help: 
[http://www.spywarewarrior.com/index.php] 
[http://forum.aumha.org/] 
[http://www.spywareinfoforum.com/] 
[http://bleepingcomputer.com]

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