Have you tried updating your Codecs? I only mention this because I was having some problems with some dreams but not others, soon as I installed the Vista Codec pack everything went back to normal.
I am still however unable to install the latest version of Deskscapes because when I do my computer just Reboots with-out any warning, so I just rolled back to the previous version and I have Zero issues with the older version. There are a lot of really kewl things you can do with the new version, but when it sinks the ship it's gotta go... I've tried 3 different times over a 4 or 5 month period, no luck, each time I installed it I got a similar issue, out of the blue reboot, Opening Joint Ops or Battlefield Vietnam.
The team thinks it's my computer, but I only have problems when Deskscapes 3 is installed. My computer is normally up 24/7 because I run a server off of it and only rebooting when Microsoft does an update that requires it or I feel it's time to reboot... could be a week or could be 2 or 3 weeks before I think about rebooting. I'll just continue using the version that works for me.
I have 2 gigs of ram, X1300/X1550 Radeon, 2 Monitors 1 19" Normal, and a 22" wide screen, near 700 Gigs of hard drive, Dual Core 2 X 4800+. My Base Score is 4.0, or lowest score, I believe the lowest score you can have to run Deskscapes is 3.4 or somewhere around there.
Any how try updating your Codec, you can find them here: http://www.mediacodec.org/download/ .