Hi Zwilnik,
Since it depends on the year of the product, I searched on several fronts for answers and here is what I found.
The tool is called PCCTools and can be found here for PC-cillin 2002 or 2003 : http://www.support.antivirus.co.uk/trendmicro/kbresolution.jsp?hmid=2530&appId=1
The exact download link is here : http://knowledgedocs.misgl.com/Facets/Trend/pccillin2003/Installing%20Uninstalling/PCCtools.zip?timestamp=1212445860533
A guide in Word format is here : http://knowledgedocs.misgl.com/Facets/Trend/pccillin2003/Installing%20Uninstalling/Uninstalling%20PCcillin%202002%202003.doc?timestamp=1212445860533
A short illustraded guide is here : http://www.valdosta.edu/helpdesk/guides/antivirus/ManualRemoval2003.shtml
For uninstalling help directly from Trend Micro, go here and answer a few questions : http://esupport.trendmicro.com/support/consumer/answerguide.do
Also found this on a post elsewhere :
To uninstall the 2005 program, please search for this file:
Go to My Computer > Local Disk C: > Program Files > Trend Micro > PCC2005_1244 > TOOLS > look for PCCTOOL.EXE Once you find the file (it has a hammer and a capsule icon) double click on the file to open.
Once you double click, a new window will pop-up. Please close the search window and just leave the PCCTOOL open.
Go to the UNINSTALL tab and click on 4.UNINSTALL button. This will start uninstalling your program.
Restart your computer after uninstallation.
After you restart go to My Computer > Local Disk C: > Program Files > delete Trend Micro folder
Hope that helps
Ciao
Quantum Dragon