Computer works fine in safe-mode but,--->?

In safe mode windows loads only basic windows things which is needed to run window. It even doesnot load sound, graphics and LAN drivers. So it boots fastly. It run slowly in normal mode then your hardware capability may be not enough to run Window 7 smoothly. For decent you need at least 256 MB graphics card, Dual Core processor 2.0 GHz,1 GB RAM