can_cworld, if only it were that simple... unfortunately it isn't so you need an antivirus security program. Please give us more details, such as what antivirus and anti malware security programs you have installed.
Firstly, do you know the name of the virus? and what are the symptoms that lead you to believe you have a virus on your W7 pc? It could be malware, spyware, adware, root kit worm etc which require different programs to detect and remove it/them (you might have more than one).
The attrib string you were putting in the command line is to reset the attributes of the flashdisk so the files were accessible again (no longer hidden), here is the list of the parameters (-h -r -s /s /d etc) and what they do click here
If so and you now just need to unhide the folders on other drives, put the relevant drive letter in the Attrib each time. If you have a lot of different drive letters there is a .bat file you can run to automate the unhide click here
Post back if still got questions/problems
This thread is now locked and can not be replied to.