Error message: Your system has not been modified. To complete installation at another time, please run setup again, when installing Readiris Corporate 12.

Hi Anas,

Check if there is any information with error code related to the issue in the event viewer that might help us in troubleshooting the issue:

What information appears in event logs (Event Viewer)?

There is two event about it but i didn't understand what to do with them :

# The first :

Log Name:      Application
Source:        MsiInstaller
Date:          25/12/2011 05:38:54 م
Event ID:      11708
Task Category: None
Level:         Information
Keywords:      Classic
User:          Anas-PC\Anas
Computer:      Anas-PC
Description:
Product: Readiris Corporate 12 -- Installation operation failed.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MsiInstaller" />
    <EventID Qualifiers="0">11708</EventID>
    <Level>4</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2011-12-25T15:38:54.000000000Z" />
    <EventRecordID>37487</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Anas-PC</Computer>
    <Security UserID="S-1-5-21-3211315619-4250530237-1269371594-1000" />
  </System>
  <EventData>
    <Data>Product: Readiris Corporate 12 -- Installation operation failed.</Data>
    <Data>(NULL)</Data>
    <Data>(NULL)</Data>
    <Data>(NULL)</Data>
    <Data>(NULL)</Data>
    <Data>(NULL)</Data>
    <Data>
    </Data>
    <Binary>7B44334343464334372D373243412D343644372D393741462D3334314335464646453537427D</Binary>
  </EventData>
</Event>

...................................................................................................................................

# The second :
Log Name:      Application
Source:        MsiInstaller
Date:          25/12/2011 05:38:54 م
Event ID:      1033
Task Category: None
Level:         Information
Keywords:      Classic
User:          Anas-PC\Anas
Computer:      Anas-PC
Description:
Windows Installer installed the product. Product Name: Readiris Corporate 12. Product Version: 12.00.5694. Product Language: 1033. Manufacturer: I.R.I.S.. Installation success or error status: 1603.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MsiInstaller" />
    <EventID Qualifiers="0">1033</EventID>
    <Level>4</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2011-12-25T15:38:54.000000000Z" />
    <EventRecordID>37488</EventRecordID>
    <Channel>Application</Channel>
    <Computer>Anas-PC</Computer>
    <Security UserID="S-1-5-21-3211315619-4250530237-1269371594-1000" />
  </System>
  <EventData>
    <Data>Readiris Corporate 12</Data>
    <Data>12.00.5694</Data>
    <Data>1033</Data>
    <Data>1603</Data>
    <Data>I.R.I.S.</Data>
    <Data>(NULL)</Data>
    <Data>
    </Data>
    <Binary>7B44334343464334372D373243412D343644372D393741462D3334314335464646453537427D3030303033383632653032376563303233383631643933333837386338393361613730663030303030393034</Binary>
  </EventData>
</Event>

The usual reasons for error 1603 are:
•You are attempting to install to an encrypted folder.

•The drive on which the folder to which you are attempting to install is located or accessed as a substitute drive on the system.

•If the SYSTEM account does not have Full Control permissions on the folder to which you are installing the package, the error message will be displayed.

Windows 7 Compatibility Center
http://www.microsoft.com/windows/compatibility/windows-7/en-us/default.aspx

Help with Windows 7 compatibility problems
http://windows.microsoft.com/en-us/windows7/help/compatibility
Make older programs run in this version of Windows (Windows 7)
http://windows.microsoft.com/en-us/windows7/Make-older-programs-run-in-this-version-of-Windows

Have you tried right-clicking on the shortcut to the program, or the .exe, and selecting the "Run As Administrator" option? Do so even if your user is an Admin. Try right-clicking on the actual Setup.exe and selecting the "Run As Administrator" option? Do so even if your user is an Admin.

Windows Virtual PC
Download Windows XP Mode
http://www.microsoft.com/windows/virtual-pc/download.aspx

Windows XP Mode (Windows 7 only, but not any of the Home versions) "You are not eligible to download Windows XP Mode. You must have Windows 7 Professional, Enterprise, or Ultimate to run Windows XP Mode". If you have an old XP CD (or other older Windows CD) available you can just download the Virtual Machine and skip the XP Mode download. This covers the whole gambit of virtual machines in "Home" versions if you want to have a look at it. Of course you will need a licensed copy of XP to install and run in any of them (except XP Mode).

your system has not been modified to complete installation at another time, 

please suggest.