Hp m7030 with XP Media Center crashes at start up Screen

After a power outage the subject computer would blue screen and go back to boot menu.  Any menu choice would cause the same process.  Disalbled the boot option that caused the return to the boot menu and was able to read the blue screen.  Error 0x0000007B is reported.  Talk about a virus, bad hard drive or hard drive controllers and running Chkdsk /f.  Tried to run a bootable cd with antivirus programs and it would blue screen when it was trying to start its program (BartPE).
Removed drives.  there are 2 SATA 250G drives and 1 350G removeable drive.  I could see the removeable drive and one of the SATA drives when installed on my computer.  Ran my antivirus and malware with no infections.  The boot drive could be seen on my computer but when I tried to view the contents I received an error message, "Corrupt folder or file" and nothing would be displayed.  Ran chkdsk /f on the drive and it worked on the dirve for several hours.  Repaired? some corrupt sectors and worked on security ids for a long time.

Placing the drives back in the computer it will now boot to windows but numerous processed are not running.  ie - the explorer taskbar does not show up, windows explorer will not run.  

Well, it seemed time for a repair install.  CD runs until it says it is starting windows and the blue screen shows up.  Disconnected all the drives with the same result.  

Computer has 4 1G memory sticks.  Two of them will allow the XP CD to get to the point mentioned above and then blue screen.  The other two never let the computer start.  There are no POST signals, audible or visual.  

At this point I am sure I have two bad memory sticks and two questionable sticks.  the problem is definetely with the memory system.  How do I proceed?