·Did you make any changes to the computer before this issue started?
You may try to expand the dll file to your computer and check if it helps you fix the issue.
To expand the dll file to the computer, follow the steps below:
To use Expand.exe from the Run line, follow these steps:
a.Insert your Windows XP installation disk into your CD drive or DVD drive.
Run, type expandsourcedestination(where source is the path to the file that you want to expand on the Windows XP installation disk, anddestination is the path to the location where you want to save the file), and then clickOK.
c.Assuming your CD drive is D: the command would be “expand D:\i386\msdtcstp.dl_
c:\windows\system32\” without quotes and press enter.
Restart the computer and check if it helps you access add or remove programs.
If the above steps fail, you may try to run a System File Checker (SFC Scan).
To run SFC Scan follow these steps:
a. Click Start, and click on run.
b. Type cmd in the box and click on Ok.
c. At the command prompt, the following line, and then press ENTER: sfc /scannow
Access the link below to know more about running System File Checker.
Using Add/Remove Programs and Add/Remove Windows Components, you see this message:
Setup library msdtcstp.dll could not be loaded, of function OcEntry could not be found.
Contact your system administrator. The specific error code is 0x7e.
The msdtcstp.dll file is either missing or corrupt, your system PATH variable is incorrect or your system is afflicted with malicious software (or all of the above).
Using Windows Explorer, browse and see if the file is present.
The msdtcstp.dll file should be in this folder:
Since it is one of the 3498 files that is covered under Windows File Protection, if it ever was installed and working, it should never be "missing" unless something else is wrong, but you can just go ahead and replace it with a known good copy and then
work on any remaining issues.
You can search your system for copies of msdtcstp.dll and copy one into the correct folder replacing the missing or suspicious file. You need to replace the file if it is missing, or overwrite the afflicted file if it is suspicious.
There should be a a copy of msdtcstp.dll file in this folder:
Just copy c:\windows\system32\dllcache\msdtcstp.dll and paste it into the c:\windows\system32\setup folder to replace it.
Respond in the affirmative if asked to overwrite the existing file.
Test your system now.
If you can't find the file and have a genuine bootable XP installation CD installed and the CD is drive X, expand the file from the i386 folder on the CD into your c:\windows\system32\setup folder by entering this command from a Command Prompt window: