As the others have indicated, Norton is no good on the Mac. It is well-known for causing performance and stability problems, and its detection of Mac malware is only mediocre. The anti-malware features built into Mac OS X do a better job of detecting Mac malware right out of the box than Norton does. Uninstall it.
As for the malware, that's Windows malware that cannot affect your Mac in any way. Assuming it's even actual malware, and not a false positive on the part of Norton. You should not remove it using Norton or any other anti-virus software. For proper removal, see:
How to remove infected files
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