Zackraa: I can't speak from direct experience with that system, but I can say that I'm using a system w/ 1.7GHz Celeron, 512MB System ram and an Intel 82845G onboard graphics adapter (which Vista doesn't recognize as anything beyond standard vga adapter). WindowBlinds runs fine on the system. Vista, well, that's a different story
To really get the full benefit from WindowBlinds, I would highly suggest installing a dedicated video card. These systems with onboard graphics are really unable to fully live up to standards in gaming or skinning. From what I can tell, it appears that your system is not capable of installing a dedicated video card. One method to definitely improve performance would be to install additional RAM. If you're interested in exploring this option, here's a useful site I have used in the past to find the maximum capability of system RAM for a particular computer: http://pny.com/configurator
Rather than speculate, it would probably be best to just check out the trial version. There should be a link to that available here: http://windowblinds.net
Keep in mind that once you do purchase any of Stardock's software, you are free to continue using that forever. The only restriction is placed on how long you are able to continue upgrading. If you purchase applications standalone, it's while they're in that major version that you may continue to upgrade (i.e. WindowBlinds 5 versus WindowBlinds 6). When purchasing a subscription like Object Desktop, you are able to continuously upgrade for a period of one year from your purchase date (unless of course you extend the subscription at any point).
Edit: Thanks for the support everyone, some of what is posted here may be redundant (as I took too long to compose this forum post), but that's ok
-Mike
[Stardock Support]