Modified using Regedit; can't access programs/change back

[I tried to download the file as requesting the in the BSOD Posting Instructions, but I can't due to the problem below.]

I was trying to download/install a program, but did not have enough space in my C drive. As the download/installation was automatic, I could not directly select for the installation to occur where I wanted, my D drive (a memory card). So, I used regedit and modified ProgramFilesDir, ProgramFilesDir (x86), and ProgramW6432Dir to D:\Programs, D:\Program Files (x86), and D:\Program Files. I did not create these folders in the D drive prior to doing this.

Now I still cannot download the program I wanted and cannot open files for the program. Worse, I cannot access regedit, task manager, system restore, or other such 'crucial' things as an administrator. Using my other (non-administrator) account, I can access regedit and task manager. In task manager, under the 'Users' tab (this is in 10), the status of my administrator account is listed as 'disconnected.' When I log into my administrator account, things run slowly, and if I try to open regedit, taskmanager, or CCleaner it does nothing for around 5 minutes, then there is an error pop-up claiming something along the lines of 'There are no files.' I suspect that if I just redirect back to C:\ Program Files and C:\Program Files (x86), this might be fixed. But without access to regedit as an administrator, I can't do that. Help would be appreciated.

Thanks.

I suppose you can't just right click and run regedit as administrator from your standard account? If should prompt you for your administrator account password.

If that doesn't work can you open an elevated cmd prompt from your standard user account? Right click, run as administrator again...

If you can then you could enable the built in administrator account with net user administrator /active:yes and then sign on as that.

Thanks for the reply. I can't run anything as administrator. Although I can log into my administrator account. While there I can't even open up task manager or regedit or cmd, much less change anything there. I've tried right clicking. I know that it normally causes that pop-up where I enter my admin password, but now it doesn't do even that.

What about enabling built in administrator at boot time? Option 4 here Administrator account - Enable or Disable in Windows 10 - Windows 10 Forums

I just tried what you suggested. However, I cannot select 'Load Hive' in regedit--it's grayed out. I do not have a backup recovery USB, disc. I got 10 by updating from 8 and never made a recovery disc/flash drive. I've tried to make system restore points in the past, but haven't been able to--I assumed it was because most of the space on my harddrive is used up. I'm a bit ashamed to admit this, but it's the case. So I tried just entering the command prompt using Settings, Troubleshoot, etc. As stated, at least using this way I cannot get past the 'Load Hive' instruction. Out of curiosity, I looked at the ProgramFilesDir part. Instead of C or D, it says X; I'm assuming this is what it should be saying?

Would resetting my computer solve the problem? At this stage, I'm willing to accept the inconvenience it might cause, although I'm wondering if I'll lose the programs that came with the computer.

Thanks for staying with me here. I didn't select HKEY_LOCAL_MACHINE prior to trying to load hive. When I did do that, I was able to get to the point where I enter 'REM_SAM,' but then I get a pop-up message stating that the file can't be loaded due to "The process cannot access the file because it is being used by another process."

Maybe similarly, I also tried using command prompt to run sfc /scannow, but get a claim that it's in the middle of a repair process and to reboot the computer and try sfc again. When I do that, I just get the same message, and cannot run scannow.

I ended up just resetting the computer, getting the administrator level by using Settings, Recovery, Troubleshooting, Restart, Reset. I'm going to count this as solved, but if some future user experiences the same problem, and doesn't have this option, sorry.

Glad you got it sorted anyway :)