Trend Micro Upgrade Crashes Dell Radomly

Hello,
I have a Dell Dimension 5510 that came bundled with trend pc-cillan three year extended warranty, which was lapsing, so I downloaded a free 30 trial of trend micro security pro, and ever since (3 weeks ago) my system crashes and restarts randomly. Trend will not telephone support the free trial and the online support does not recognize the
condition described.
I am at my wits end with Trend at this point and ready to de-install the free trial.
Any information would be very helpful.
Thank you for your time and consideration.
Casey Pons
caseypons@yahoo.com
503.580.0269