dell dimension PC 80g DD maxator,factory cd rom,no floppy drive.changed desk top background and screen went black.could not get back up.used boot cd to reboot to repair console,couldn't fix there.did reinstall lost all data then ntldr is missing pops up,checked bios,cables,drives,power cables,everything,finally got usb to replace boot,got computer back up started reinstall of xppro gets all the to the first reboot to set up and says arsms file missing please insert cd xp pro but cd is still in cd drive.eject reinsert but same thing.tried i386 from usb but wont load file from there.cd drive activity light blinks slow and steady same intervals.checked power cable,seems like not reading disk,cleaned xp disk no change is a new disk from cdsfu.com already installed on 1 computer and works fine but cant do this one,disk is unlimited install and licence key.cant figure it out any ideas?