Crazy things happening - bad RAM?

[Ploper001]

After using my laptop for internet browsing and music listening etc. for a few hours, I keep getting these weird bugs, mainly to do with Explorer. Things like Task Manager just not opening (a beep instead) or opening but with half of the buttons missing, Explorer opening without any buttons or toolbars at all, Internet Explorer tabs insta-closing when I opened them, being unable to right-click on anything, some programs not closing, Explorer left-hand pane disappearing and back/forward buttons not working, etc.

A restart always fixes it but then it starts happening again after a couple of hours. I did upgrade my RAM about a month ago - is it possible that my RAM is bad? I did run Memtest when I installed them originally and it came up clean but I don't know if there's a more detailed analysis in its options that I didn't do. If it isn't bad RAM then what on Earth could it be? I suppose it might be a dodgy program but I haven't installed anything since reinstalling Windows in June that I didn't have installed before. :/

I have SP3, all updates, no viruses and no spyware either according to AVG and Ad-Aware. Any ideas?

 

[Ploper001]

I just had it happen again when I opened Media Player Classic - nothing happened when I opened it so I went to see if the process had started and I got this when the Task Manager appeared:

http://www.aotplaza.com/Files/Tek-Tips/Task Manager 1.PNG

 

[Ploper001]

Hmm it seems to be related to Explorer somehow. Currently, everything's fine until I open an Explorer window. Then things start going strange and right-click functionality disappears virtually everywhere. More examples of the effects:

http://www.aotplaza.com/Files/Tek-Tips/MSPaint 1.PNG

(doesn't open at all, just an error)

http://www.aotplaza.com/Files/Tek-Tips/Explorer 1.PNG

(missing toolbar)

http://www.aotplaza.com/Files/Tek-Tips/WinRar 1.PNG

(missing toolbar)

Just now I tried to open My Computer with another Explorer window open and it just went to the Map Network Drive dialogue box . This is a fairly fresh Windows installation so I'm very confused.