Testing RAM

Suspicious that my problems may be bad RAM I tried to run the memtest program (apparently 'Memtest-86 v 3.2') that I've had on my system for 11 years, haven't used for almost that long. It displays the menu briefly then re-boots.

I found memtest86+, built it, dd-ed it to a USB drive, but it gives me an error about being too big, overlapping the second layer of LILO, or something like that, halts.

Any recommendations for a RAM tester?