windows wont start, keeps rebooting.

Here's what happened: I downloaded a torrent file (supposed to be a PDF) and without even looking at it I double-clicked it before I realized it was an .EXE. I tried my best to stop it, but i'm not very computer savvy.

After trying to stop it I ran Malwarebytes. "Some infections could not be cleaned." I changed my setting in spybot to start itself upon restart. I noticed before I restarted my computer that whatever I installed had dumped 3 adult shortcuts, presumably to websites, though I didnt click them, on my desktop. I deleted them and then restarted.

Now my computer wont start windows. I checked other forums, as well as this one, based on the (very) limited knowledge I have of computers, and found only one person who seemed to have the same problem as me.
Basically the respondent suggested trying to delete the process from the task manager, but I dont know how to do that if windows wont load.

My computer seems to load drivers just fine but when it attempts to load windows it just restarts the computer. I was given the option to load in safe mode, last known settings that worked, and normal mode. None of these worked, my computer just restarts instead of starting windows. Also the option of starting with a command prompt, but i didnt mess with that because I dont know what it is.

I assume by copy of windows is legit, but I didnt install it myself, so I dont have a windows CD.

Any help you can give would be greatly appreciated. Also, try not to use to much technical language as I have a limited knowledge of computers. Eg: I have no idea what a registry is or how it works.

Thanks. matt