How to clean up Win7 system unknown account information

On our computer, there are sometimes unknown accounts, for those who do not know the origin of the account, in order to protect our system security, we usually delete it. So what exactly should be done?

Delete Unknown account method:

1, first right mouse click any folder select Properties, in the Open property interface, switch to the "Security" tab;

2, then click on the Security tab page Edit button, and then click to select Unknown account, then click Delete;

3, if the unknown account to the previous folder granted permission, click on the deletion will see the following prompts, this time need to go to the previous level of the folder properties of the above delete unknown account steps can be.

If you have some unknown accounts on your computer, then remove them in this way, which will make your computer more secure.