also when i made a 1 gb virtual hard drive from my pc's ram memory and import audio into the virtual ram drive and play the audio from the ram the sound quality is improved 100% like listening to the studio master tape can somebody explain this?
That sounds like you have a slow over-taxed computer, that is also possibly noisy. Given you said you are running Window7, I am going to guess it is rather old? Something that old may need a lot more processor % horsepower (comparatively) to decode FLAC, and with rotating media, it would be pulling somewhat at random from the drive to fill the buffer, with whatever other hard-drive thrashing it is doing.