A very common error, but what does it mean?

[MaNiC MoE]

I recieve this error when the computer starts, plus, I can't copy, rename, paste, move or even delete files...

I just wanna know what it means and how to fix it

Here's the link
http://www.fileupyours.com/files/81720/Quick Images/Memory Error.bmp

 

[12-Gauge]

This could help with the locked files issue.

http://ccollomb.free.fr/unlocker/

 

[MaNiC MoE]

The errror message is...

btw, here's the error message I recieve when "explorer.exe" loads :

The instruction at "0x002a3128" referenced memory at "0x900004ca". The memory could not be "read".

Click on OK to terminate the program
Click on CANCEL to debug the program

OK CANCEL

Thx, n' please help