Actually few weaks ago i installed oracle in my pc but it was of no use to me as per my exam got over then i mistakenly tried to deleted it from my pc but it did’nt removed and started showing error when ever i turn on my pc so i wanna ask that how can i remove oracle completely and secondly one of frnd told me u can remove any prog through window registry but i dont understand how can i remove it plz tell me simlple and easy process and explain in simple language what is the role of registry or window registry or registry clean???