Hi, I got a new memory stick for my Gateway laptop, model MX3215 (1 Gb), factory defaults come with 256 Mb, before installing it I format with Gateway utility disks, and since that , it is pretty fast and everything but the blue screen appears minimum 2 times per use. and windows 'error report' shows this after it has restarted: Blue screen error caused by a device or driver You received this message because a hardware device, its driver, or related software has caused a [I]blue screen[/I] error. This type of error means the computer has shut down abruptly to protect itself from potential data corruption or loss. In this case, we were unable to detect the specific device or driver that caused the problem. [B]Troubleshooting[/B] The following troubleshooting steps might prevent the blue screen error from recurring. Try them in the order given. If one step does not solve the problem, then move on to the next one. [URL="http://wer.microsoft.com/responses/Response.aspx/10/en-us/5.1.2600.2.00010300.2.0?SGD=7899d735-9cbf-4a2c-8a51-bc094f13e530#here"][IMG]http://wer.microsoft.com/Responses/include/images/right.gif[/IMG] Step 1: Download and install the latest updates and device drivers for your computer[/URL] [URL="http://wer.microsoft.com/responses/Response.aspx/10/en-us/5.1.2600.2.00010300.2.0?SGD=7899d735-9cbf-4a2c-8a51-bc094f13e530#here"][IMG]http://wer.microsoft.com/Responses/include/images/right.gif[/IMG] Step 2: Remove any new hardware or software to isolate the cause of the blue screen [/URL] [URL="http://wer.microsoft.com/responses/Response.aspx/10/en-us/5.1.2600.2.00010300.2.0?SGD=7899d735-9cbf-4a2c-8a51-bc094f13e530#here"][IMG]http://wer.microsoft.com/Responses/include/images/right.gif[/IMG] Step 3: Scan your computer for viruses[/URL] [URL="http://wer.microsoft.com/responses/Response.aspx/10/en-us/5.1.2600.2.00010300.2.0?SGD=7899d735-9cbf-4a2c-8a51-bc094f13e530#here"][IMG]http://wer.microsoft.com/Responses/include/images/right.gif[/IMG] Step 4: Check your hard disk for errors[/URL] [URL="http://wer.microsoft.com/responses/Response.aspx/10/en-us/5.1.2600.2.00010300.2.0?SGD=7899d735-9cbf-4a2c-8a51-bc094f13e530#here"][COLOR=#0000ff][IMG]http://wer.microsoft.com/Responses/include/images/right.gif[/IMG][/COLOR] Step 5: Restore your computer to an earlier state [/URL] [URL="http://wer.microsoft.com/responses/Response.aspx/10/en-us/5.1.2600.2.00010300.2.0?SGD=7899d735-9cbf-4a2c-8a51-bc094f13e530#here"][IMG]http://wer.microsoft.com/Responses/include/images/right.gif[/IMG] Advanced troubleshooting [/URL] I bought the memory on [URL="http://www.all4memory.com"]www.all4memory.com[/URL] and selected the model as exactly as the pc indicates.