Most of the Computer viruses are spreaded by removeable disks. So when users click or double click on it, then a autorun file executed normally. This kinds of autorun files contains the neccessary code to execute the virus type files. So, before clicking on it you should check whether it has a autorun file having hidden attribute on it.
It is easy to examine the removeable disk with Windows command prompt.
Just insert that device and go to the command prompt: Start->All Programs-> Accessories -> command prompt.
For Viewing the contents of all attributes of that disk, write these command:
Dir H: /A /A describe all attributes H: is examlpe drive
Now you can see all the files on it. Just verify that which files are known to you. Delete unknown files by these command below:
For deleting those files:
del /F /A H:autorun.inf / /F means to force to delete files, even of read only files
/ autorun.inf is example
Some known or recent virus type files are:
ntde1ect.com / It causes the missing of NTDLR file
Rav Mon.exe
Finally remove the disk and insert again to your port. Now it is safe to click directly on it.
