Found this, suggest giving it a try:
After installing Java Add-in from Sprinter (built-in), QuickTest Professional (QTP), or Unified Functional Testing (UFT), the mailing application IBM Lotus Notes cannot start up any more (infinite cycling re-launching again and again, after entering login/password).
To solve the problem the below steps should be applied:
Locate the ''jvm.properties'' file under Lotus Notes installation folder (by default C:Program FilesIBMLotusNotesframeworkrcpdeploy) and make a backup of the file.
Open the file (with notepad for example) and added the following at the end of the file: env.unset.Java_Tool_Options
Save the file and try to run Lotus Notes.
Note: The reported behavior is already documented in IBM Lotus Notes Forum as pure Lotus configuration error.