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#11
fralo, if you have the license on the computer case, you might try to download/install the ISO (the same version as you have for the license) here: Official Windows 7 SP1 ISO from Digital River « My Digital Life
You will need another computer with DVD write capabilities. Use this program to create a CD from the ISO you download: Microsoft Store Online
You can also use a USB stick, but I've come across complications doing it. It may work for you as I imagine my situation was unique: Windows 7 USB/DVD Download Tool - created by Darryl Licht
Also, as Karl above said, remove all other drives EXCEPT the C drive which you are installing the system to. The CD/dvd player should be the only other 'drive' connected. This includes all USB sticks. If you use a USB stick to install windows from, make sure it is FREE of viruses first.