Windows cannot access the installation sources. Verify that the installation sources are accessible and restart the installation.

This error belongs to source from which you are installing software, it can be bad CD/DVD or file missing from CD/DVD/USB Flash or network server or any other source. 

I would suggest this messge is related to the source cd/dvd corrupted. Need to install with the different media but in this case I ll have a look at my hdd also.because a faulty hard drive also can give such errors.

This error belongs to source from which you are installing software, it can be bad CD/DVD or file missing from CD/DVD/USB Flash or network server or any other source.

You have to change the CD/DVD. 

or

You have to change the SATA/IDE port, also ensure it is enabled in the BIOS settings.

If this issue is happened with all installations you trying.. then Update the windows installer to the current version. 

It is most likely a case of software incompatability, which may be fixed by updating your server, or looking for a similar software that is made for your current server.