How to include custom prerequisites in to my setup project

Hi,

I am devoloping a setup & deployment project where i got a problem . here i have a customized dilogue box in which there are 4 products , our customer can select any one of the product the 2nd and 3rd products need sql express where as 1st and 2nd product need other scanner drivers so, if our customer select 2nd or 3rd product i am checking in to registry werther the sqlexpress is installed if not installed i am starting the sql express installer but here i am getting problem

i am getting message

Another installation is in progress.you must complete that installation before continuing this one

what is solution for this . its urgent plzz help me

thanking u

prashanth




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How to include custom prerequisites in to my setup project