I inherited an old laptop when my father died. It has MSN Messenger 7.5 on it and a password in the text field (and in the system registry). I'd like to recover this password, if possible, but am not sure if it's possible/safe. There apparently are recovery tools, but I'm not sure what to trust. I'd prefer an open source tool, but I see there's a Nirsoft freeware tool. I have no experience with Nirsoft or any other developer in a matter such as this, so I don't know who to trust or what tools to use.
I'd rather not break the laptop's OS since I do have some use for it. I also don't have any recovery CDs for it.