I've messed around with some system files and deleted all the basic ones when i clicked a cmd file. Those missing are mainly the accessories such as calculator, paint, notepad and major programmes such as windows move maker and Outlook express as well as Internet Explorer (i've tried reinstalling IE but it still dosent work). The biggest problem now is that i lost core system files such as the windows login screen, task manager and whenever i click the shutdown (turn off computer) button, the computer will just hang and freeze at that page. Is there anywhere i can download and just simply replace those files or reinstall them without using system restore or reformatting etc?