Ok, I checked these websites: AIDSLINE, The San Francisco Ais Foundation and MediLine on Reproductive Health. A quote from the last one is:
"The most frequent reason for a false negative result is a test done during the window period before the person has antibodies. It is important to remember that someone who has tested negative because they are not infected with HIV can become infected the following day if they indulge in risky sexual behaviour!"
And all the other site said the same thing. False Negative is a result of timing, but not because the test are insufficent. Since its been 4 years, you can be SURE you are not in the window period of 3-6 months. You are in the clear!!
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Good Luck and Be Safe
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