Secunia – software inspector says that some programs require tedious or confusing patching procedures, so by default it starts in a mode that shows you only "easy-to-patch" programs. It's a much better bet to have Personal Software Inspector tell you about all applications that need patches, not just ones that are easy to patch. To make the change, select Settings and uncheck the box next to "Show only 'Easy-to-Patch' programs." Note that Secunia PSI is free for home use, but requires payment for business use. Download Secunia PSI - PC world.
To Protect your files/sent through Email/ cant see by others, You can also have the documents turned into PDFs and sent that way instead of as Office documents. SendShield is in beta, and for now is free. However, when it gets out of beta, there is a chance that it will become for-pay software. (The company provided no details on timing or pricing.) Download SendShield Standard
Avast includes automated updates of virus definitions. The independent testing site AV-comparatives.org rates its effectiveness as Advanced+, the top level. I've been using the program for well over a year and a half, and it's caught every threat that's come my way. Note that Avast is free for home use, but requires payment for business use. Download Avast! Home Edition
To detect the spyware,malware,etc. The software will also delete suspicious items, and it includes other useful tools, such as one that will generate a log of all programs that run on start-up. Keep in mind that if you're not an expert, you shouldn't try to use this program on your own. Think of it as a last resort when standard anti-malware tools fail. Download HijackThis
this software to get secured from spyware, active-x virus, etc.includes extras as well, such as disabling Flash running in Internet Explorer. And it also lets you create a system snapshot, so that if at some later point you get infected with spyware, you can always revert to a clean system. Note that if you don't use Internet Explorer, there's no need to install this software, because Firefox, Opera and Safari don't use ActiveX. Download SpywareBlaster
Warning: Only very experienced users should attempt to clean their PC with this software, because if you rename or delete valid files, you can cause serious problems. If you're at all unsure about what you're doing, you might want to try a different free anti-rootkit tool called RootAlyzer, from the same folks who bring you Spybot Search & Destroy. It checks your PC for rootkits but doesn't offer tools for deleting them. (Note that RootAlyzer is still in the preview stage.)Download F-Secure Blacklight Rootkit Eliminator
The answer? A great Firefox extension called NoScript, which not only blocks scripts, plug-ins and various types of code, but also protects against cross-site scripting attacks. It lets you block scripts, plug-ins, and code on a site-by-site basis. You can control it to an exceptional degree, including whether to block scripts on sites on a one-time basis or permanently. Download NoScript
Another very good free firewall is Online Armor. Computerworld editor in chief Scot Finnie prefers its paid version to any other firewall. The free version is excellent as well, with one shortcoming: To install a new version, you first have to uninstall the old version, then install the new one. Download Comodo Firewall Pro
For anyone who wants to keep their browsing life private — and keep their system clean and running smoothly — this is a must-have download. Download CCleaner
Source : Computerworld/PC World