Memory problems are sometimes caused by other components in the system unit. Dirty and corroded slots can produce memory bank problems.
There are some good ram memory testing software that you can download when you suspect your system is having memory problems. MemMXTest is a utility to test memory at http://panic.et.tudelft.nl/~costar/memmxtest where you can download their program.
Gold Memory is a neat standalone memory testing shareware at http://www.goldmemory.cz/index.php and you can use it free for the first 30 days. After that you will need to register the software for just $24.00.
Brain Check at www.brain.com/braincheck_sst_1pg.htm is an online memory test site where, after you sign up for an account, you can scan your computer's memory in the hopes of detecting early ram memory problems.
Open your computer's system unit and locate the ram memory. Do you know what type it is. Do you have the user manual readily available should you need to quickly identify your memory chips?
Be well prepared ahead of time to know where your memory is located in the computer, what type they are and the indications that your memory is going bad. Take the time to understand your computer's memory now.