How to delete viruses in computers without using any anti-virus software?

You can remove virus manually but there is no unique way to do this because all viruses are different.So first end the suspicious tasks,either on the task manager or using some softwares like process explorer.Then look for the values in registry or search for the virus files by showing all hidden files and unchecking the "Hide protect the operating system files".Some times the virus will disable these so you have to use a program called disk investigator and find the virus files and delete it.But this is not very easy so better use some good updated anti viruses.

If you know the exact names of the infestations you could take a look at the register. Chances are you'll blow up your computer though. So better be safe using good software than sorry removing viruses manually. :)

That will be like playing with ones own self even after having so many advanced technologies. I suggest you to install an freeware antivirus so that you need not to worry about the future destruction that you will cause after deleting it manually. I heard that viruses are detected based on their memory. Like for example a new folder virus will have some where around 64 kb and that will be constant even if it creates a new folder with the same name.

Could you share the ideas with me.

Well, i recommend you to use an antivirus software. Viruses are easy to make but not so easy to delete. But if you want to make your own antivirus, make sy\ure your all data is backed up in any removable storage media and UNPLUG it. Then you go to the virus file and edit it using resource hacker. I still dont recommend it if you are not so proffesonal as it may ruin your hdd. Well, best of luck

Go into safe mode, and log into administrator. Find the viruses location, and delete the file, if a windows system file is infected by the virus, simply download another file from the internet.

you can delete it by booting in safemode and delete what you have install that have a virus...