i have a problem while iam installing acrobat reader 9 pro

[mohamed_sobhy]

this error appear (error 1335: the cabinet file 'Data1.cab' required for installation is corrupted and cant be used)

[Jeffrey_A_Wright]

Are you installing from disc?  Are you able to copy the files successfully?  Which version of Windows are you using?

[mohamed_sobhy]

yea iam installing from my disc and iam able to copy files successfully, and iam using windows 7 ultimate

[Jeffrey_A_Wright]

If you did not receive a disc error when copying the files from the disc then I would recommend installing from the files which were copied.  It is possible your optical drive maybe running into issues when trying to read the data1.cab file during installation.

[mohamed_sobhy]

its on portable hard disk, not a CD

[Jeffrey_A_Wright]

You can try solution 6 and 7 in Error 1311, 1335, or 2350 "Source file not found...data1.cab" when installing Adobe products | Windo....  Those solutions are aimed at the Windows Installer Service as being a possible cause.  I do think it is more likely that the data1.cab file is corrupted but they are still worthwhile steps to try.