So, I'm not exactly sure what I did. I was clearing up some space on my computer after using the Norton Removal Tool to get rid of this Norton trial popup that came up everytime I booted my computer. Now, after it told me to restart, it seems to be stuck in an endless boot cycle that resets itself after showing the Windows logo. I've since tried running startup repair, which freezes as it shows the progress bar for 'Windows is loading files'. Safe mode will not work, either. It just sends it back into the boot cycle. Not sure what to do at this point. My computer came pre-installed with Windows 7 Home Premium 64bit, so I don't have any startup discs. Help?