Windows cannot access the specified device, path, or file

for me while installing any antivirus it shows: "Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item."
i am using windows 7 , i used all exefix register editor
still not working?:crybaby:

Check to see if you have permission to open the file:

1. Right-click the file or folder, and then click Properties.
2. Click the Security tab.
3. Under Group or User names, click your name to see the permissions you have.
4. Click Edit, and then click to check the check boxes for the permissions that you need, and then click OK.

For more information, go to this link - http://support.microsoft.com/kb/2669244

thanks but your method doesn't helped me
i seperately installed malwarebytes anti-malware
it scanned my pc & restart my pc that's it, problem get fixed.:thumbup1: