Problems with xp sp2, (think it's svchost related)

Well sometimes I get a svchost error. memory cannot be read. Almost every time though my windows live messenger gets an error report, when that happens my windows media player also gives me a memory cannot be read error.

This is what happens when I get no svchost error on startup.

When I do get an svchost error, xp barely runs right. Takes a bit longer to shutdown as well.

Once in a blue moon, everything will run perfect and my windows live messenger starts up fine.

This started happening a couple days ago. I keep my computer pretty clean with AVG, spybot, ccleaner, windows defender, diskeeper, and registry mechanic. Help me guys.:confused