Hello tazloccsta and welcome to Seven Forums.
I'm guessing you used HP Disk Sanitizer. As you probably know, this is a utility that can securely erase all data from a hard drive. HP ProtectTools - keep data, networks and communications protected from threats
Ordinarily I'd suggest you try to return your computer to a previous condition by using a restore point from a date/time prior to using Disk Sanitizer. But I'm not at all confident this would work. It would be way too easy for an unauthorized person to gain access to your computer and "undelete" the data you thought had been securely deleted. But you can give it a try. System Restore
One of the Forum experts has prepared a couple of troubleshooting guides that may help. Troubleshooting Windows 7 Failure to Boot Troubleshooting Steps for Windows 7
Or you might want to skip directly to a repair install. It will try to fix your currently installed Windows 7 and preserve your user accounts, data, programs, system drivers, etc. It would probably take less than an hour and if it works, you'd just have to reinstall Windows Updates. Repair Install
You could also use this opportunity to do a clean reinstall and eliminate the HP bloatware and useless factory installed utilities that just slow down a machine. Clean Reinstall - Factory OEM Windows 7