tabctl32.ocx definition, relationships, removal:

This is a part of a malicious parasite that violates user privacy and damages the compromised system. The tabctl32.ocx file can be used for different purposes depending on the related parasite's type, functionality and carried payload. Although tabctl32.ocx may not take any malicious actions by itself, it ensures that a parasite is working properly and therefore needs to be removed. DO NOT open, execute or edit tabctl32.ocx!
The tabctl32.ocx file is installed and used by keylogger Golden Eye.
Sometimes a presence of tabctl32.ocx does not indicate that your computer is infected. It can be an essential system file or a file installed by harmless legitimate software and therefore may not pose any threat to your privacy and the system. Although such cases are quite rare, you should thoroughly examine tabctl32.ocx before completely deleting or leaving it in the system.