Which anti-virus is better?

I open a program it closes unexpectedly There is a possibility that your program is corrupted, not properly installed, or so. What kind of program that closes unexpectedly? Is it a lot of programs or only one program? the capslock light on my keyboard is no longer working And also there's a possibility that the problem lies in your keyboard and not because of virus. Have you checked via plug another keyboard? And even if the light can't be turned on, can you still write in Caps? (I believe you can, since you were using some caps in this discussion.. ) I just want to say that not every computer problem are caused by virus.. The problem might be something else. And anyway, for the good Anti Virus, I suggest you to install AVG Anti Virus. Works great so far here. Well, Avast and Avira are also good, though.. Just make sure don't install two anti viruses at the same time. It may slow down your computer..

I use avast and it works nicely. So i suggest you to use this antivirus.

"Best and Free" is little tricky.. :-) but yeah.. I suggest you to use AVG.. which is I guess best among the free antiviruses.. you can try to 30 days trial of any paid antivirus and first get rid viruses from your computer. then you can go for free one..

download stinger first (it's free) after that cleanup would be good too, next you can install an other virus killer for example avast or panda (both are free and you can find them at download.com)

Any antivirus that you already knows are good even those that are free you just have to be updated always and scan all removable drive on your computer before you open it.

I think anti viruses may slow down computers. You should try to download simple and free anti virus programs like avira.