Error While Installing Windows 7 ultimate

[phpownz]

Hello, when i try to install Windows 7 Ultimate x32Bit Version,after i choose Language a error comes.. it says "A required CD/DVD Drive Device is missing. If you have floppy disk/DVD/CD or USB flash drive please insert it now"
What Should i do?
Please Help
Thanks.

 

[logistopath]

Is it a legitimate version that you are trying to install? Please clarify. Because most often these errors are seen in "copies downloaded off the net".

 

[Spartacus]

The issue is a Bad Burn - please try burnig the ISO once again and try installing