I download my skins either from Wincustomize or from joejoe.biz since his site has some of the best Vista ports to date.
None of the skins i have downlaoded (which is a lot) have ever come with any packaged software. That might be a thing of StyleXP. I have never had that issue with WB.
With WB5 they have done a good job of working out the bugs and everything. I have never had a instance where it was because of WB that i had to restart or anything.