Hi, can anyone please explain why in this site bellow it says that:
"If you are attempting to clean install with a Windows XP Home or Pro Upgrade CD, you will see this screen, which requires you to insert your previous Windows CD in order to verify that you qualify for the Upgrade version. Curiously, it says that you can use CDs from Windows NT 3.51 and Windows 95 in addition to those from 98, 98 SE, Millennium, or 2000, though these products cannot be upgraded to XP. Once you’ve proven that you qualify, hit ENTER to continue." http://www.winsupersite.com/showcase/windowsxp_sg_clean.asp
So does this mean that if i want to update my windows from 2000 to Xp i will need a previous windows CD ? I read somewhere else that only a Windows Xp CD will do, thats why i am really confused…

I used to be able to burn cd’s with my roxio burner until i accidentally uninstalled something in my remove programs file. now the computer wont let me burn because my DLL was not found. what do i do? i have no windows cd, no money to buy repair software and do i still have my roxio installed?

FROM A WEBSITE ON SFC: To protect your computer from old system files, Microsoft created a special service that is built into the operating system. This service monitors your system files, and if one is replaced or deleted, ICS will automatically restore the system file. SFC works in conjunction with a utility called Windows File Protection that keeps the system file cache: (%Systemroot%\System32\Dllcache) uppdated with the newest Microsoft Approved files as they are installed on your system. I prefer to use the system backup for the ability to roll back to a former configuration however. To manually invoke the system file checker, be sure you have administrative access then go to the command prompt and type: sfc /scannow The system will immediately begin to check all the current system files and restore the cached approved copies. You may be asked to insert the Windows CD as well during the restore. IS THERE ANY SOFTWARE AVAILABLE TO DOWNLOAD SO THAT I DONT'T HAVE TO USE THE CD?