RICHED32.DLL no longer registered

I am working with VB5 on Windows2000 in a dual-boot configuration with ME. I recently downloaded a virus/worm checker (TDS-3) and it seems to have disabled the Rich Text box control and DLL..

Projects using the RTF box now have errors on loading into VB (although run-times are OK), and attempts to re-register the same or a different version of RICHED32.DLL using RegSvr32.exe fail.

How can I get the design-time facilities of RTF back? Will it require a re-installation of VB? or of W2k?

OOps! I just ran regsvr32 on richtx32.ocx (in winnt\system32 from a msDos prompt0, and now my rtf boxes are back.
Phew!!