twcu.exe is a application which is probably legit. So, if twcu.exe is on your PC, it is probably ok, and will NOT cause problems. Even if your system is clean, it is still recommended to run a good antivirus with a good track record, in order to defend your PC against viruses and malware.
This program is usually stored on disk in C:\Program Files\TP-LINK\TP-LINK Wireless Configuration Utility\TWCU.exe.
The MD5 fingerprint for this file is b51c339cf04dabd57f5b18988b3a283b.
This executable runs in 32-bit mode. It does not benefit of the full set of features of current PC processors. This is quite normal because the makers did not upgrade it to 64-bit code.
twcu.exe appears to have a visible user interface. This is good because it doesn't work in a kind of stealth mode. Its operation is clearly shown to the user.