rundll32.exe is a program which is probably legit. So, if rundll32.exe is on your computer, it is probably ok, and will NOT cause problems. Even if your system is virus-free, it is still recommended to purchase a good antivirus with a good track record, in order to defend your PC against threats.
Normally, this program is stored in C:\WINDOWS\System32\rundll32.exe.
The MD5 checksum for this file is 731a783a36a8e69a6434d19d98b12a09.
This program does NOT operate as a Windows service. This is normally a good sign.
rundll32.exe appears to use the functions of Windows SFC (System File Checker) or Windows File Protection.
This is a 64-bit executable. It runs using the full capacity of nowadays' computer processors.
The description written in the file is Windows host process (Rundll32).
File version extracted from the file 10.0.16299.15 (WinBuild.160101.0800).
Company name Microsoft Corporation.
Intellectual property rights notice © Microsoft Corporation. All rights reserved..
This application does NOT have visible elements of user interface. This is usually a bad thing.
rundll32.exe has a digital signature. Today the large majority of serious programs are digitally signed.
The digital signature attached to rundll32.exe checks out perfectly. This is most likely a clean, ok program.
Digital certificate name: Microsoft Windows
Certificate's issuer name: Microsoft Windows Production PCA 2011
This executable does NOT have an uninstall command set up in registry.