Perhaps it wasnt the correct procedure for copying from floppy to CD and you have corrupted something!. Try doing an error check [the old system file check]. If still the same, try restore back to last restore point. You don't say which OS you are using but for XP its:
My PC>right click drive>Properties>Tools>Error Checking>Check Now> tick the top box and reboot.
System Restore is start>programs>accessories>system tools>system restore.