Please help! I was trying to install a Harry Potter CD-Rom on my niece's old HP Pavillion computer over the holidays. There wasn't enough memory to install the software so I started to delete things to increase the memory available. I thought I was only removing unnecessary things. I freed enough memory to install the Harry Potter software but when I tried to restart the computer afterwards it gives me an error message, saying "invalid command, please install the disk and press any key." I assume that I accidentally deleted something necessary for system start-up. I tried to reinstall Windows 98 but it says there isn't enough memory. I am stuck with the error message. Help. How can I fix this problem? Thank you, in advance, for any help you can offer.