if you have some folder option problem, i mean sometime folder option displays in tools menu. but we can't change some option. like we can't show our hidden files and folders. # tools_folder option_view_files and folders_hidden files and folders in this path there are two important choice to dispaly hidden files and folders. 1. "do not show hidden files and folders" and 2. "show hidden files and folder folder" here, we can't change this option from first one into second one. therefore we can't show hidden files and folders. because of virus attack. if we change this option and press o.k it won't change. and there is another important option "hide protected operating system files( recommended )" we clear that tick in this option. if takeout that tick it will show viruses. but we can't change these option. this time viruses may running. sometime those may deleted by anti-viruses software. anyway you can use some antiviruses to remove those viruses. example- kaspersky, AVG if you removed those viruses this time you can see still you can't change those option. because viruses have changed regedit option. so, this time please open the Regedit option. you can open run and type regedit and enter it. it will dispaly a dialog box. here go on this way HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/Current Version/Explorer/Advanced/Folder/Hidden/SHOWALL and make sure that, checked value shold be(1) and default value should be (2) and go on this way HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/Current Version/Explorer/Advanced/Folder/Hidden/No Hidden in this path you should make sure that, checked value shold be(2) and default value should be (2) and there is another option go on this way HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/Current Version/Explorer/Advanced/Folder/Super Hidden here you should make sure that checked value should be(0) and default value should be (0) if there is any different in these numbers you should change those number like above model. then go to folder option and change those option now those will change.