I had a few trojaans and viruses. This may have affected my external hard drive :driver model: hd103uj Samsung. It worked fine before. Now it says there are no drivers installed for the External hard drive. Please provide assistance

Hi,
You want to save your data with out Format all thepartition ,download hiren boot, from the bellow link.
http://www.hiren.info/bootcd-on-usb-disk

Now burn the ISO file, under image burning option,from nero ,in the another pc which is run's well. Restart pc, the cd will start soon, if the hiren boot cd ,willnot run, set bios setup. Now click herefor BIOS SETUP ,restart again and select miniwindows and delete system volume information and RECYCLER from all the partition or drives except "C"drive(Partition C:)
Because "systemvolume information" and "RECYCLER" is the Heart of Castle. If it not removethe virus ,download bootable f secure,click here And write the ISO under image burning option,from nero and boot from CD. Now you can scan for fix.
Insall clean OS, delete partition C: and create C same .

If you do not want install the OS ,download combo fixfrom bellowthe link
http://combofix.net/

Follow all the steps.Rstart the pc >press F8> select save mode usethe down arrow key .copy and paste the combofix and dubble click on it and wait for few minutes. Do not do any thingwhen the combo fix will be running.Let them do .
If you need more information, reply me soon.

Thanks