First of all, are you using SP2?
Secondly, check that all drivers are up-to-date.
By Windows logo testing, do you mean if Windows is a valid copy? That's what I'll assume, but if that's not the case, then just ignore this.
To see if Windows is "valid":
1. Go to
http://www.microsoft.com/resources/h...s/default.mspx
2. Hit the Validate Now button. if necessary, install the ActiveX control necessary. If your system fails, then it probably is restricting your computer for that specific reason. If it passes, then you probably have an outdated driver or incompatible hardware.