Problem description:
When you install Internet Download Manager version 5.03 or earlier on Windows Vista, it may cause conflicts with several Internet applications and services. The problem is caused by an old version of IDM Advanced Browser Integration feature. The feature used LSP Dll that was incompatible with Windows Vista. The problem has been fixed in Internet Download Manager version 5.05 build 3.
Please note that IDM has stopped supporting Windows Vista. The latest version supporting Windows Vista is version 6.41 build 6 from Dec 3, 2022.
Problem solution:
Please update Internet Download Manager to the latest version.