Macbook Pro is failing me in several ways

Hi everyone,
I first noticed my computer was being strange when I had to type in the wi-fi password everytime I opened it even though all of my preferences were selected correctly. Then, my preferred network was properly listed as my top preferred network in my settings, yet everytime I opened the computer a notice would come up saying "None of your preferred networks are available. But these ones are:" and then the first one listed would be my preferred network.
Also, I can't go on any website without my mac telling me that somebody is trying to impersonate the website, whether it be facebook, scotia online, etc. Apparentley everyweb site except for google is unsafe and can't provide proper certification or something. So I called Apple, and they sent me a Mac OSX Snow leopard disk so that I could erase my hard drive and install the new software [ currently have Mac OSX Lion] and my computer would be at factory settings, thus erasing any viruses which I thought I had.
Now, when I try to install the Snow Leopard software, I restart my computer, hit the options key, and select the disk and my computer is stuck on the same screen and is making three consequetive beeping noises which apparentely means there's an issue with my RAM. I read somewhere else though, that Snow Leopard isn't even compatible with my 2011 Mac. Why would Apple give me this option then? Would my computer make that sound just because they aren't compatible or is there actually an issue with my ram? Could a virus do this? I noticed it right after my mother was on a sketchy casino website.
What should I do? I start another semester at university in two weeks and I really need my laptop.
Thanks to anyone who answers!
Samantha.

No, personally I have never had this kind of problem.
Try to wait a minute, if it still won't let you in press and hold power button for 10 seconds. then press power button again to start computer.
If it boots this time correctly - run disk utility to check and repair permissions and disk.
Additionally there is an update just issued by Apple form macbook Pros 2012. it might be that this update is working and thus slowing down your boot process. If not after booting the computer and repairing the permissions check for updates.

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