MD5 & SHA Checksum Utility (portable)

MD5 & SHA Checksum Utility is a tool that allows you to verify the integrity of a file by finding out its MD5, SHA-1, SHA-256 and SHA-512 signatures, as the name implies. Its features can be seamlessly handled by inexperienced users.

The interface of the program is quite simple to figure out, as all the options are visible in the main window. So, you can open a file by using either the file browser or "drag and drop" method; the MD5, SHA-1, SHA-256 and SHA-512 checksums are automatically displayed and you can copy either of them or all text to the Clipboard. In addition, you can insert another hash, in order to compare it to the file's.

http://www.softpedia.com/get/Security/Security-Related/MD5-and-SHA-1-Checksum-Utility.shtml

McAfee Stinger (portable)

McAfee Stinger removes 6,000 common viruses and 'fake alert' malware on-demand. It is not a replacement for a full antivirus, but handy in many situations. McAfee Stinger is freeware for personal and business use and requires admin rights.

McAfee Stinger detects and removes prevalent Fake Alert malware and threats identified in the "List Viruses" section of the Stinger application. While not a replacement for full fledged antivirus software, Stinger is updated multiple times a week to include detection for newer Fake Alert variants and prevalent viruses.

http://portableapps.com/apps/security/mcafee-stinger-portable

PeerBlock x86 & x64 (portable)

PeerBlock is an IP firewall with support for blacklists and whitelists. It can be used to block advertising, spyware, activity monitoring and more. PeerBlock requires admin rights to function.

PeerBlock Portable includes the 32-bit and 64-bit variants of both the legacy and modern versions of PeerBlock, automatically selecting the appropriate one, for full support on every PC you use.


x86 & x64  https://portableapps.com/apps/security/peerblock-portable

Comodo Firewall for Windows

Comodo's award-winning firewall provides users with prevention-based PC protection that slams the door shut on viruses, malware, and hackers.

Features

• Defends your PC from Internet attacks
• Control what files run on your PC
• Prevents malware from being installed
• Auto Sandbox Technology™
• Cloud based Behaviour Analysis
• Cloud based Behaviour Whitelisting
• Award winning & highly rated Firewall

Read the firewall results at Matousec

http://www.comodo.com/home/internet-security/firewall.php

Malwarebytes' Anti-Malware Free

Malwarebytes Anti-Malware is a surprisingly effective freeware antimalware tool. It's a relatively speedy malware remover, with the quick scan taking about 8 minutes even with other high-resource programs running. The heuristics engine proved on multiple computers during empirical testing that it was capable of determining the difference between false positives and dangerous apps.
Do note that the real-time protection is restricted to the paid version, as is the scheduler for updates and scans. Overall, though, Malwarebytes Anti-Malware is a responsive malware remover that does what it should with a minimum of fuss.

http://www.malwarebytes.org/