How to change system directory while in safe mode command prompt?

My system is infected with oufddh.exe.I was able to remove it from c drive by the following procedure.

Go into safe mode with ms-dos, type ';cd..'; twice until you got the C:%26gt;

Then type ';attrib autorun.inf -r -s -h'; and enter,

then type';del autorun.inf';, done.

This must be done with every single hard drive or USB drive



The problem is i dont know how to scan in other drives and usb drives.Infact i dont know the command to change the drive.Please help me.How to change system directory while in safe mode command prompt?
typr A: for the A drive F: for the F drive

E: well you get it.I think thats what you asking.