i have app's that connect to a msde database and i have app's that connect to an sql data base. presently i have sql installed on one pc and msde installed on another pc can i install both msde and sql server on the same pc with out effecting the 2 data bases.
My guess is no. But you should be able to use the MSDE database with SQL Server, as MSDE is simply a stipped down version of the SQL Server Engine. Try detaching the MSDE database, copying the files to your SQL Server machine, and attaching them there. Should work.
Don't forget that you may need to recreate any user accounts from the MSDE side that your app might be looking to use.