Diana at last the solution to the CD-1 error finally emerged.
After many installs- reinstalls from the cd rom I have copied all 4 cd's on the hard disk and install directly from it , into a new directory(after Bioware's moderator Kevin Lynch direction).
Everything up to now work flawlesly, the only incompatibility found is the Desecration of Souls mod which kept crashing to the desktop every time I attacked the Cowled wizards.
The installation order is SoA+ToB+latest patch+Baldurash(non weidu)+Tortured Souls+Freedom's reign+reign of Virtue+Ease(all)+Ascension+ExpThfStronghold+Solafein+Tactics(all)+ItemUpgrade.
Thanks god all the frustration is gone and I am again a very happy BG player!