The first thing that you will want to do is go to the Add/Remove Programs and try to uninstall the previous version of SystemSuite if it is still in there. After uninstalling the previous version, please try to install the latest version once more.
If it still generates a message stating it detects the previous version of SystemSuite, it may be that there are some registry settings still on your system. In that case, please use the following tool to clear out those settings:
Simply download and double-click on the file to run the tool. After it has run, please try installing the program once more.
Note: Please only run this tool after you have attempted to uninstall the program via the Add/Remove Programs. This tool will not remove program files that are removed by using the Add/Remove Programs. Running it before going through the Add/Remove Programs may cause difficulties with uninstalling the previous version of the program.