The core answer you need is in a few of these posts, especially the last two, but they are missing a key factor that someone earlier mentioned.
Step 1 - boot to safe mode. As soon as you restart, hit the F8 key repeatedly until a black screen with different options for starting are listed. Select the "Safe Mode With Networking" option and hit enter. The computer will boot to Windows, but with only enough programs to support bare essential processing including the internet which you will need to install the anti-malware programs. This mode prevents most of the malware from running and slowing things down and preventing proper removal of itself.
Step 2 - Go on the internet and install a series of anti-malware programs like Malwarebytes, Superantispyware and Spybot. After each install, make sure to run the update process to get the latest/greatest removal tools. BTW, someone on another forum claims that Superantispyware will remove SWP2009 demo. I'm heading to someone's house tonight with this bug and will try it first-hand.
Step 3 - Run each program from safe mode and make sure to remove all that spyware that they find. Often, you need to restart to complete the removal - this is an important step so do it right away, but make sure when it restarts, to reselect the F8 to enter back into safe mode.
Step 4 - Any of the programs that found something, go ahead and rerun it in safe mode 'til it's clean and finds nothing. I've had Malwarebytes work for some of the nastiest bugs, but it took 3 passes with each pass removing more until it was clean.
Step 5 - Once your programs are running clean in safe mode, go ahead and restart into normal mode (don't hit f8, let it boot normally) and see how it is.
If you are still having problems, you can use one of the online expert forums to get help. They have specific instructions about what to do before asking for help and how to post to the forum. Sometimes, it's a bit challenging to follow all the steps. At this point, you may want to consider booting back into safe mode and removing any files, photos and music off your computer and then reinstalling your original software to start over.