This problem started when my friend tweaked around with my laptop to try and fix a problem with my USB external HDD. For the past week, I have been getting this error which applies to pretty much every program on my laptop. When I open a program... (name of program) has encountered a problem and needs to close. We are sorry for the inconvenience. If you were in the middle of something, the information you were working on might be lost. This error comes out around 70% I open a program. I am either forced to close the program by pressing on the 'Close' option or drag the window to a space on the screen and use the program. I also get this error called dwwin.exe. I understand it's some Dr Watson error reporter but I have no idea to fix it. It comes out along with the first error mentioned. In the dwwin.exe error it says "The instructions at (example) 0x7c883f9c referenced memory at 0x7c883f9c. The memory could not be "written". I have noticed that my computer has slowed down considerably and often hangs. I can't start any downloads; an attempt to do so will result in my laptop hanging. I found this out by trying to download HJT... Any, any help will be greatly appreciated. Thank you very much for taking the time to read this; I've been hopeless struggling with this. P.S. If you think it is a must to get HJT, I can download it onto a USB drive (not the spoilt one) on another computer and transfer it onto my current one. Please tell me if you think this is appropriate.