My computer can not read win 7 DVD instalation disk

OK ... just to be 100% sure..
If I recall - XP and Office come on CD's and Win 7 on a DVD.

You 100% sure you got a DVD player? If you are...and it reads other DVD correctly - then I guess you have a faulty win7 DVD.

HTH
Cheers
 

Soda-88

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you can download win7 image and burn it to a dvd

http://www.wincert.net/forum/index.php?/topic/8906-official-windows-7-sp1-disks/

make sure you download the version that is covered by your licence