Steam

NIS 2011 is letting steam go through the firewall but the antivirus says  the following:

 

 

 

Full Path: c:\users\Chris\appdata\local\temp\~li288b.tmp
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On computers as of:
3/4/2011 at 11:37:25 PM
Last Used:
3/4/2011 at 11:37:25 PM
Startup Item:
No
Launched:
No
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Many Users
Thousands of users in the Norton Community have used this file.
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High
This file risk is high.
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Threat Details
Threat type: Heuristic Virus. Detection of a threat based on malware heuristics.
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Origin
Downloaded from  URL Not Available

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File Actions
File: c:\users\chris\appdata\local\temp\~li288b.tmp
Blocked
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File Thumbprint - SHA:
93f79b7c666265c8d2819f79ed0b06e68ca0626142d2ce1292d4f4f45c71ef27
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File Thumbprint - MD5:
5f53ed93111e98ea7b5e71b3c8956e01
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Can you please help? This is a temp file being blocked so I may play Avatar.