Hacker problems so I reloaded Snow Leopard. Afterwards, Mac had to delete 798 items. Now looping on 4 items to delete for the past 2 weeks. Can't reboot, reload, or restart. I have to let the battery run down for it to turn off. How to fix this, please?

Question

I had hacker problems so I reloaded Snow Leopard. Afterwards, Mac had to delete 798 items. Now it is looping on 4 items to delete for the past 2 weeks. I can't reboot, reload, or restart. I have to let the battery run down for it to turn off. I think a big part of the problem is that someon one the internet (the hacker) was mirroring my hard drive. It seems to have locked up my system. I could be wrong about this guess, though. All I do know is that it is now looping on the last 4 iems, and I can't do anything.
Well, I can get it to turn on, but all it does is continously try to delete the last 4 items. When I try to reload Snow Leopard, it tells me my hard drive is full and that I need to delete items.
Can anyone help? I am so lost without my Mac. I am back on the PC, and though it works, I'm sure many of you will understand when I say it's just not a Mac.
Thanks.

Answer 1

I installed Snow Leopard using my Apple external Superdrive. I followed directions I found on the Apple site. Here is the article info:  Mac OS X v10.6 Snow Leopard: How to Erase and Install  
                 Article HT3910
                 located at: http://support.apple.com/kb/HT3910
Everything was going smoothly until I got to the reinstall part. I had to choose to reinstall on a hard drive or network drive. I've never used a network drive; just the hard drive. It seems that's where the troubles began. I selected the hard drive. It seemed to go well, and then I got the message that I needed to delete some files because I was out of space. I chose to get rid of my music files, but, there were only 636. I don't know what the rest of the files were. I was using the Secure Empty Trash command.
That was my first time doing an erase and install. I tried to do it again, but I now get a continuous error telling me that my hard drive is full and I must delete files. Only I can't delete files because 4 files are still being deleted and my computer won't let me stop the process.
I found out about the hackers mostly by the fact that whenever I used to watch something like Hulu or Netflix, I never had problems with internet connection or speed. Lately, I had internet connection problems. I went in to check my settings for my internet provider and found out the settings had been changed to public and all these extra computers were connected to my network.