My Dell 3350 doesn't comes along with that installation kit (recovery kit) to factory set up. Had already called Dell but coming to a month still yet to receive the kit after calling them for more than 3 times.

I not gotta wait anymore thus require help how can I reformat manually without the CD.

I had used the below method but there's still some program files not totally wipe off which I don't get to see them inside the "Programs & Feature" folder.

Some programs left over the icon behind but not installed. Some programs not found in  "Programs & Feature" folder but once click the icon, the program start running.

Press F8 before the windows logo

Press Repair Computer

Select Dell Backup & Recovery

Select "Dell Factory Image" (the only choice available)