msvcr70.dll
This file is not a system component: microsoft visual c++ 2002 runtime, no longer distributed. Restore it from the source that installed it rather than downloading a replacement.
The error names your specific file, but the fix is the same for the whole family: every Visual C++ runtime file and which redistributable ships it.
If the file is already there and Windows still complains, read the message again: “entry point not found” is a different problem from a missing file, and installing the runtime again will not solve it.
And if the box says RUNDLL rather than naming a program, the fix runs the other way: something left an instruction behind pointing at a file that is meant to be gone, so restoring the file is the wrong move.
Do not download this DLL on its own
Searching for a missing DLL by name leads to sites that hand you that single file. It is one of the oldest and most effective malware delivery methods there is, and a system DLL from an unknown source is indistinguishable from a deliberately modified one. There is never a legitimate reason to obtain a runtime component that way.
The same goes for the tools that offer to do it for you: what a DLL repair tool can and cannot actually fix.
What it is
The C runtime from Visual Studio .NET 2002. Microsoft has not published a redistributable for it in over twenty years, and no current package contains it.
Where you see it: Software from the early 2000s, industrial and laboratory tools, and old installers that were never updated.
Programs of that era were supposed to ship this file in their own folder. If it is missing, reinstalling the program is the correct fix, because its installer is the only legitimate source. Newer Visual C++ redistributables will not help: the versions are independent of each other and 2002 is long out of support. If the program is business-critical and the installer is gone, running it inside a virtual machine with an older Windows is safer than pulling a twenty-year-old system file off a download site.
Why there is nothing to download here
There is no verified download we can offer for this one, because installing a file is not the fix. The steps above are what actually resolves it. That distinction matters: the sites ranking for this file name are selling a download that would not have helped even if it were safe.