BSOD help needed

I have a 1 year old machine I built that has operated flawlessly until the last few weeks. Now I'm getting BSOD at random times, sometimes after a few minutes of use, sometimes hours. This is a Vista 32 Home premium OS. I get messages about unexpected shutdowns listing dump files, but I don't know what to do with them. If I look at the event viewer, there are several errors listed with different sources, again, I don' t know what to do with them. I don't think its an overheating problem. All fans are working, and the Asus board monitors show cpu temp 27C, system temp 36C. When I touch various components, they are just barely warm. All trouble seemed to start after we added a wireless printer as a network printer. It occasionally seemed to cause an IP address conflict message to pop up. I changed the IP address and have not received any more of those complaints, but maybe it did something? I've also received an occasional message from Trend anti-virus saying that unexpected shutdowns could be caused by a bad update and that it has reverted to an earlier versions to control that. So if anyone has any good ideas about how to investigate this I would appreciate the help. I do have snapshot jpeg's of some of the error messages I can email. I've tried to run memtest, but it blue screened after 1.5 cycles, although no problems were noted up to then. I also ran chkdsk, but it blue screened just before completion (92% into step 5 of 5), no errors had been reported up to that point.

It sounds like a RAM issue to me. RAM problems are the most common cause of BSOD's. What are your complete system specs?

Antec case -- Sonata II if I remember with their 500W earthworks supply

Run memtest86+ with one stick at a time, alternating memory slots.
Make sure your memory voltage in the bios is correct.

I can do this; last time I tried was with both sticks and it blue screened after 1.5 passes. Do you mean something like slot 1, stick A then Stick B, then slot 3, A then B?

Check the memory voltage on Newegg and put it in the bios.
I am not getting the right part on Newegg.com.
It may be the cause of your BSOD.
Rerun memtest86+ with the correct voltage.

Yes this is the correct one. I think I read it as a CS and its really C5 but I will check the voltage. This is on my home machine, I'm at work now so it will be later this evening. I'm also going out of town on Thursday for several days, so it may take a while if I don't find the problem by Wednesday.
Thanks for the help.

Steve

Try running the computer with only stick A.
See if there are any more problems.

Hi again, I've been away for a few days.

When I returned the computer was still running, hadn't rebooted like it does when there's been a bsod. I put both sticks back in and also ran registry mechanic, which found some errors. Has been running for a couple of days now without crashing, thats something of a record recently. I'm just going to watch it and see if it misbehaves again, but so far looks good.