http://www.amazon.com/PNY-512MB-PC133-SDRAM-Memory/dp/B000063K75/sr=1-1/qid=1163366994/ref=sr_1_1/103-5383826-9922253?ie=UTF8&s=pc
http://www.amazon.com/Kingston-512MB-PC133-DIMM-LP-CL3/dp/B00006HTMU/sr=1-8/qid=1163366994/ref=sr_1_8/103-5383826-9922253?ie=UTF8&s=pc
http://www.amazon.com/ACP-EP-Memory-512MB-PC133-168-PIN/dp/B00006BA9U/sr=1-13/qid=1163366994/ref=sr_1_13/103-5383826-9922253?ie=UTF8&s=pc
Look in your PC's manuals to find the correct memory card used. If you can't find it there, open the case and look at the actual card and also if there is another slot to use for inserting another, at least. 256 RAM card. If this is too much for you to handle, ask a knowledgeable friend of yours or take your machine to a reliable computer shop to check it and to install the right memory card for you.
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