If your M1330 graphics chip is the Intel X3100, installing the latest driver should solve this issue. You can grab the latest X3100 (GM965) driver here:

http://downloadcenter.intel.com/filter_results.aspx?strTypes=all&ProductID=2800&OSFullName=Windows+Vista*+Home+Premium%2C+32-bit+version&lang=eng&strOSs=153&submit=Go%21

Choose the .exe format. You MUST uninstall the current driver prior to installing the above driver.

If you still experience this problem with the latest drivers, there is another solution: disable the TMM service. Follow these instructions:

1) Open the Task Manager: Start / Type "task" into the search bar (without the quotes)

2) In the Task Manager window, expand the left-hand menu:

Task Scheduler Library / Microsoft / Windows / MobilePC

3) Disable TMM

Select TMM / right-click / disable

4) reboot

-phil

We have a new XPS M1330 in our family. The first one we got would randomly change the resolution so that only 6 icons would fit on the desktop. It worked but everything was so huge! As things progressed, we started seeing vertical lines.

Dell Nvidia GeForce 8400M GS 128MB

Vista Home Premium

I posted more about our experience in this thread...

xps1330 vista ultimate -- bad video

http://www.dellcommunity.com/supportforums/board/message?board.id=Tech_Talk_XPS_Laptop&message.id=9878#M9878

My advise would be to assure that you have the latest BIOS and lastest video driver installed. Then if the problem continues call Dell Support. It is important to record problems A.S.A.P. with Dell.

Lilla