Click Start-> run ->cmd->select your desired drive for eg:- f:->type dir/w/a this will show all the files in that drive.
Then type attrib -r -a -s -h *.*
this will remove any kind of restrictions on the file you wanna delete
Then type the file name to delete
the common types of viruses are
These are only a few that are actually visible..
My advice use a good antivirus also to be sure ...