I have a Dell Dimension 4100 operating w/ Windows ME. I recently purchased a new 80 GIG HD and went to install and load Windows XP. I removed the old HD and plugged in the new one (no longer using the old one), set the BIOS to read the CD and when I started I received a msg that said invalid boot drive, please insert boot disc in drive A: It doesn't seem to recognize the XP CD no matter what I do. Any suggestions? 