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try McAfee stinger, it is a free tool that allows you to scan files for common viruses and malware<br />
<a href="http://vil.nai.com/vil/stinger/" rel="ugc">http://vil.nai.com/vil/stinger/</a><br />
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for just malware i use malwarebytes's anti spyware <br />
<a href="http://www.malwarebytes.org/mbam.php" rel="ugc">http://www.malwarebytes.org/mbam.php</a>
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try McAfee stinger, it is a free tool that allows you to scan files for common viruses and malware
http://vil.nai.com/vil/stinger/ [http://vil.nai.com/vil/stinger/]

for just malware i use malwarebytes's anti spyware
http://www.malwarebytes.org/mbam.php [http://www.malwarebytes.org/mbam.php]

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Thanks but what I am looking for is a utility that inventories your files when you initially install your operating system and checks for changes or compares differences like.. a month later. &nbsp;I was told it was out there but dont remember the name.
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Thanks but what I am looking for is a utility that inventories your files when you initially install your operating system and checks for changes or compares differences like.. a month later.  I was told it was out there but dont remember the name.

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Sorry I did not respond to this earlier! 
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Something to verify if files have been added since original install to check for malware or something undetected? &nbsp;Thanks
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Something to verify if files have been added since original install to check for malware or something undetected?  Thanks

Is there a free tool to baseline file inventory and periodically check your os ?

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).

Network Analysis

A vulnerability is a weakness which allows an attacker to reduce a system's information assurance. Vulnerability is the intersection of three elements: a system susceptibility or flaw, attacker access to the flaw, and attacker capability to exploit the flaw. To exploit a vulnerability, an attacker must have at least one applicable tool or technique that can connect to a system weakness, known as the attack surface. Vulnerability management is the cyclical practice of identifying, classifying, remediating, and mitigating vulnerabilities. Other vulnerabilities include security risks, security defects and constructs in programming languages that are difficult to use properly.

Vulnerabilities

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.