The original TweakUI does not work on an OS other than XP or earlier.
There are tweakers out there for Windows 7, but I would use them
problems usually can be resolved without the use of 3rd party utilities.
We need more clear information, not just a I think its called power toy or something. E1505 Dell
What is the exact error message if any.
And have you downloaded the WDM driver for your video card.?