I keep getting an error message re: System Extensions

Almost every time that I run Software Update or when Norton runs its automatically scheduled scan, I keep getting an error message saying, "System extension cannot be used. The system extension "/System/Library/Extensions/IomegaSAM.kext" was installed improperly and cannot be used. Please try reinstalling it, or contact the product's vendor for an update." I've also been having problems with Safari, in that when I've had a browser window open for a while and use it to go to different websites, etc., after I've gone to 2 or 3 websites it will then act like it's "stuck" and it won't do anything else until I close the window, quit out of Safari, and start it up again. Then it will be fine and work for a while, until it does the same thing...again.
Are these items somehow related, and how do I fix this?

Hello Valerie Anderson,
I'm Harry from Norton Support team. Please check the information provided in a similar thread here:
https://discussions.apple.com/message/21854775#21854775
Let me know if this helps.
Thanks!
Harry

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See Troubleshooting issues with iTunes for Windows updates.
tt2

HT1151 I keep getting an error message when installing new software that says "System extension cannot be used /system/library/extension/IoFireWireWDHID.kext was installed improperly" I have no idea what this means and all of my software seems to install

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Hello Valerie Anderson,
I'm Harry from Norton Support team. Please check the information provided in a similar thread here:
https://discussions.apple.com/message/21854775#21854775
Let me know if this helps.
Thanks!
Harry

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C:\Program Files (x86)\iTunes
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tt2

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Apple Software Update
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HT1923: Removing and reinstalling iTunes for Windows Vista, Windows 7, or Windows 8
tt2

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I am trying to download the latest version of iTunes to my PC (windows XP) and I keep getting an error message or two. One is that it can't uninstall the previous itunes version, the other is that it can't find itunes.msi.

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apple_master New Delhi, India
This solved my questionRe: Unable to Purchase
Apr 16, 2012 10:22 PM (in response to eight4seven)
This worked for someone
I had this problem for about six weeks. I was following this forum but was too unsure of what might happen to try the fixes that were suggested.
About two weeks ago I decided to delete the downloads.28.sqlitedb file (usingDiskAid(a free program), on a PC running Windows 7). The original downloads.28.sqlitedb was 936 KB. The new one that the system created is 80 Kb., and has stayed at about that size. After about four days I also deleted all the other contents of the Download folder. Ten days later and still no more problems. Downloads are much quicker, nothing greys-out (as was happening frequently before).
Everything has worked well since with no more error messages.
I am using an iPod 4G, iOS 5.1 (originally iOS 5.0). I do not have a manifest file, and as far as I know, have not had one. DiskAid can search the whole "hard drive" on the iPod.
Deleting downloads.28.sqlitedb and the contents of Downloads worked for me.

I keep getting an error message re: System Extensions

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