Can you please help me fix my computer?

My computer was being terribly slow today, so I tried to restart it to improve performance (something I do all the time – the longer between restarts, the more issues it gets).

When I try to start my computer, it says it wasn’t shut down properly (not true), and gives me the option to:
– Start in Safe Mode
– Start in Safe Mode with Networking
– Start in Safe Mode with Command Prompt
– Start in last known successful configuration
– Start Windows normally

No matter which option I choose, it continues start-up for a few seconds, then reboots. This continues as an infinite loop.

After trying all these options, I switched my hard drives around so the bad drive was a slave, formatted my other drive, and used it to run a virus scan on the bad drive. It turned up six issues, all of which my antivirus resolved. I then ran a chkdsk command, which did not detect any errors in the bad drive. After switching the drives back, the bad drive still would not boot.

I am all out of options, short of backing up all my files and fully reformatting the bad drive. Do I have any other options?