I have installed a new hard drive. The new unit is initialized with the letter F. (This is the third unit in the machine.) I can access the disk again after a normal startup, starting from the old drive. However, when the unit is disconnected then starting it again comes up with the following message.
Windows has detected a registry/configuration error.
Choose Command Prompt Only, and run SCANREG
Missing or corrupted files: C:\windows\himem.sys
Missing or corrupted files: C:\windows\dblbuff.sys
Missing or corrupted files: C:\windows\ifshlp.sys
Cannot find win.com, unable to continue loading windows
after that if I type the SCANREG on C prompt then it tells that it is a Bad command. My computer is running the Windows XP in it. Can you tell me that what can be the problem with this and how can it be solved? Thank you so much in advance for reading and replying to this.