After recently upgrading to the 2008 version, I decided to try the "File Cleaner" tool as an experiment since I had accumulated a lot of temp files -- I usually used CCleaner to purge these files. I ran the jv16 "File Cleaner" in the default "Safest Mode" since it was my first attempt at using jv16 program for file cleaning. It found a large number of supposedly ".tmp, .temp, .gid, and .chk
Since I had become comfortable with the jv16 "Registry Cleaner" -- which I always did a backup on before fixing/deleting, until I had 2 years of experience where I never once had to restore jv16 cleaned registry values. After the "File Cleaner" finished, I unfortunately clicked to proceed with the "clean" without making a backup (stupid I know). After jv16 cleaned the "temp" files, I could not start several application programs (e.g. TurboTax Deluxe 2007) which I wanted to use.
I rebooted my computer and found that Windows XP Home Edition would not boot at all, giving me an immediate error message that "NTLDR (New Technology Loader) is missing -- please press ctrl-alt-delete to reboot". This was a never ending loop. I used a friend's computer to investigate the problem on the internet and found that this was caused by 2 missing .dll files (NTLDR and NTDETECT.COM). I followed all troubleshooting recommendations (1) copy the files from the Windows CD to my C:\ drive, (2) Use the Recovery Console to run FIXMBR and FIXBOOT, etc., but Windows still would not boot up. I ended up doing a "Major Repair" under the "Windows Installation" option to try to recover without re-installing Windows and loosing everything on my hard drive.
Fortunately, the major repair enabled Windows to boot. However, I had to reload Windows SP 2 and seemingly endless Windows XP updates. I also had to update many Windows and Other device drivers before the devices would work at all. Many of the application programs on my computer still worked, but about 30% had to be totally re-installed including: TurboTax Deluxe 2007, Windows Media Player, Internet Explorer 7, Partition Magic, AI RoboForm, Quicken Legal Business Pro, and ClocX.
I take full responsibility for being an idiot and not selecting to "Backup" before deleting the files identified by the "Safest Mode" scan. I had grown complacent with my experience with the "Registry Cleaner" over the past 2 years. But, I have to say that a file cleaner tool that selects critical Windows files and critical application files for deletion in the "Safest Mode" is a tool in need of some rethinking or at least a clearer cautionary labeling. I spent about 6-8 hours restoring my computer back to health after cleaning files from a "Safest Mode" scan. While I am ecstatic that I didn't loose everything and have to wipe my drive clean and re-install Windows XP, it makes me wonder if this tool doesn't need a little more work before being unleashed on the "less than expert" computer user.
I want to thank jv for the wonderful tools at a great price -- and I will continue to use them and recommend them to others. I am a bit afraid to use the "file tools" at this point, but this is a small price to pay for a really great "registry cleaner".