Vista - extended desktop problem, Vista 64bit

I have been using a second monitor (Acer AL2216W) with my Vista Home Premium 64bit laptop as an extended desktop and all worked fine until yesterday. Now the 2nd monitor display is offset to the left, and I can't seem to find any setting that will correct it. Basically about 1.5" of blank space on the right side of the 2nd monitor that is unusable - it acts as though it has reached the edge of the display.

Any ideas?

Make sure you have x64 drivers for it or you will have issues with that monitor, I should know, it is the one I have.

Last time I checked (couple of months ago) Acer didn't have x64 drivers for it so I used the ones for the AL2216WD... works like a charm now.

Thanks! I'll give that a try once I get back this weekend. The only thing that puzzles me is that it was working fine for at least a month, and just started with the problem a couple of days ago. I'm wondering if the problem started after a Windows update - seems like that happens sometimes!

I am still trying to learn why Vista does some weird things that appeared to be done by ghosts in the machine.

I say ghost because it sure is not done by malaware or viruses since, according to my A.V. & A.S., my pc is clean.

I am sure is because it runs some automated application that I don't even know about so I can't disable or stop it from doing it and since it doesn't bother me that much, I leave it alone and I live with it

Any suggestions for locating those 64 bit drivers? I've checked out Acer's website but can't seem to find them. Also have found various sites that will scan and update but not for free.