Recieved the following--Windows could not start because the following file is missing or corrupt:<Windows root> \system32\hal.dll.Please re-install a copy of the above file.HOW do I do that-step by step PLEASE!1 person needs an answerI do too

Here are a number of possible reasons/solutions http://pcsupport.about.com/od/findbyerrormessage/a/missinghaldll.htm and more information here http://support.microsoft.com/kb/314477