Password issue - disks missing and can't install new anti-virus -- HELP!!!

Hi,
I've got a Mac Mini and since I moved it appears I lost the Mac disks. I've got some serious issues with the Mini's web-browsing slowing down, maybe virus issues and I need to renew my subscription to my anti-virus to hopefully correct the issue. It appears that I need to know the password, which I never set, but I need one to log-in.
What I understand is that I can reset the password to be able to install my anti-virus, but what I'm seeing is that I can't do it without the disks. How in the world do I correct this issue??? You help will be greatly appreciated.
Thanks,
JimBo

Welcome to Apple Discussions!
There are two issues here, the first being your password. If you can't remember your password and really do need to reset it, you will need your MacOS disk. If you have lost this, it would be wise to get a replacement - you can get these from Apple. Since there are other occasions you might need the original install disk, it's not just for an occasional password reset that you would do well to have one on hand.
It's not clear, however, in this situation why you would suddenly need a password. You say you did not originally set one, which is unlikely since it's one of the first steps in the initial set up of the system. It is of course possible to set a blank password, in which case the password will remain blank of course. The password would be required every time a major install or update was being run.
The second issue is the web-browser slowing down and your thought that this may be virus issues. This is highly unlikely. While there are a few potential Trojans which can gain access to MacOS, none seem to be in wide circulation. There are no viruses. More likely if you're noticing performance issues in your web browser is that you are suffering something more akin to cache issues or possibly a small amount of free drive space. Depending on which antivirus product you already have, it may even be that which is the cause, since this type of software typically adds considerable load to the CPU when running.
That isn't to say antivirus software is a bad idea, because it is better to be prepared than taken by surprise and have no defensive software in the event that MacOS becomes targeted. It's also beneficial to have it if your Mac is in a mixed environment where otherwise you could pass infections unknowingly to Windows systems.
In this situation I would be inclined to do some basic system maintenance using a tool such as YASU, but even that would require your password in order to run. As such, I would first try to clear your browser caches (in Safari, you'll find 'Empty Cache' halfway down the Safari menu) and obtain a replacement install disk from Apple to enable you to get full control of your system if indeed you have a password set and don't know what it is.

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