Hello Ashkab,
Be so kind not to top post and trim your replies.
On Sat, 2012-08-11 at 20:43 +0430, ashkab rahmani wrote:
installing all packages is very bad idea. many of them may conflict in installation process or after it.
The distribution is build by upstream so packages within a release do not conflict with one another. An installation including every single packages should not be a problem.
If the original poster is seeing dependency issues with the ISO install he should probably take a note of what package it is that is missing from that particular ISO so the CentOS team can look into it and correct the spin if needed.
Regards, Leonard.