Just to update. My sonic stage is now working. I received a reply from Sony which did the trick. here is the reply from Sony, perhaps it can help anyone else who may find themselves in the same predicament ..... ""Thank you for your recent enquiry. Regrettably we are unable to support the Sonic Stage software in environments where either the PC is custom built or the Operating System has not been factory installed. This is not intended to reflect on your capabilities or your set-up in any way, or indeed to pass judgement. It is however necessary to specify this restriction in order for Sony to provide meaningful troubleshooting and recreation of fault conditions at our support division. Therefore all we can suggest further is that you try the following; ** If you are running Service Pack 2 please follow the instructions in Section 1, else go to Section 2. ** Section 1 * Click on the [start] button and select [Run...]. In the dialog box type explorer and click on [Ok]. * Click on the [Tools] menu and select [Folder Options]. Click on the [View] tab. * In the [Advanced settings:] section select the option to [show hidden files and folders]. Click on [Apply] [Ok]. * Go to the folder [C:\Windows\Inf]. * Right click on either [MDAC.INF] or [MSACINST.INF], whichever file is present, and then click on [install]. * If you are prompted for your Microsoft Windows CD, insert the Windows CD into your CD drive, click on the [browse] button and go to [C:\Windows\ServicePackFiles\I386] folder on your hard disk and click on [Open]. Click on the [Ok] button. * If at any time you are prompted for the Windows XP CD, click on the [browse] button and go to either the [C:\I386] or the [C:\Windows\I386] folder on your hard disk and click on [Open]. Click on the [Ok] button. * Restart your computer. * Re-try starting Sonic Stage. Section 2 * Click on the [start] button and select [Run...]. In the dialog box type explorer and click on [Ok]. * Click on the [Tools] menu and select [Folder Options]. Click on the [View] tab. * In the [Advanced settings:] section select the option to [show hidden files and folders]. Click on [Apply] [Ok]. * Go to the folder [C:\Windows\Inf]. * Right click on either [MDAC.INF] or [MSACINST.INF], whichever file is present, and then click on [install]. * If you are prompted for your Microsoft Windows CD, insert the Windows CD into your CD drive, click on the [browse] button and go to either the [C:\I386] or the [C:\Windows\I386] folder on your hard disk and click on [Open]. Click on the [Ok] button. * If you are not prompted for your Windows CD, click on the [browse] button and go to either the [C:\I386] or the [C:\Windows\I386] folder on your hard disk and click on [Open]. Click on the [Ok] button. * Restart your computer. * Re-try starting Sonic Stage. We apologise for any disappointment this reply may cause."" Thanks for your help Ishiyoshi kind regards Elbow