Won't Boot From CD/DVD After Running Ubuntu

[spesave]

I am posting here in hopes of getting some assistance with a problem I have been having. I have been running Ubuntu on my Dell Inspiron 1420 laptop, but I recently decided to try Windows 7. Windows 7 would not boot from CD/DVD as long as Ubuntu was still on the computer, so I completely reformatted the hard drive and tried to install it again. The computer would still not boot from the CD/DVD drive, even after removing Ubuntu. I have gone into the BIOS and changed the boot order so that CD/DVD is listed as number one, but it still will not work. I have also used F12 and selected boot from CD/DVD but this did not work either. The Windows 7 disc works fine on other machines, so I know it's not a problem with the physical disc. The hard drive has been completely debugged and zeroed out. The funny thing is, the Ubuntu disc will boot from the CD drive just fine, but other discs won't work. I have tried to boot a Windows 7 and Windows XP disc but neither will work. In both instances I get "press any key to continue" but when I press a key nothing happens. I feel this has something to do with the Ubuntu, as my computer would boot from this drive with no issues before I used Ubuntu. I would appreciate any suggestions regarding this. I have spent several days trying to solve this problem to no avail.

[devils casper]

Hi and Welcome !

In a few machines, Windows Installation CD/DVD doesn't work after Linux installation. You have to clear MBR of Hard disk.

Boot up from Ubuntu LiveCD, open Terminal and execute this

sudo dd if=/dev/zero of=/dev/sda bs=512 count=1

Note : Above code will *wipe your Hard disk*. There won't be any partition or data in disk and it will be as brand new blank Hard disk.

[spesave]

Thanks so much for your help! I will definitely give this a try. Thanks again!