I'm not joking about this - the best thing to do is likely reinstall Windows
If your daughter, intelligent as I'm sure she is, has installed loads of random cr-- stuff from the internet it is likely the registry is bleeped along with most of the major dlls in your system. An SP2 installation may well fail because you system is beyond repair.
But you need a battle plan:
First get the model name of the computer and download all the latest drivers from Dell etc. ON YOUR MAC.
Also go to Kaspersky (google it) and buy/download their latest Antivirus Software Home Edition.
Download the latest version of FireFox too - NEVER use IE again. If you have a problem with FireFox, make sure you have the latest version.
Burn that all to CD.
Get a copy of the Windows SP2 Install CD or if you have a fast enough net connection download it from here
http://www.microsoft.com/downloads/...BE-3B8E-4F30-8245-9E368D3CDB5A&displaylang=en
Ignore MS's stupid warnings - download it on the Mac and burn.
Back up all important information on her computer onto CD or 512MB Flash Key. If you need a way of moving data buy a Flash Key, they are real inexpensive now. If you look through your data properly you will be AMAZED at the amount of stuff you don't need.
Ditch the games, really. If you want your PC to stay clean for more than 5 minutes then set up a ten meter exclusion zone for ANY demo or magazine CDs anywhere. If you can't convince her to do that then leave the PC as it is.
Next take the PC down from any network connection you have and boot it off the System Restore/Windows CD. If you need to go into the BIOS and change things around. COMPLETELY ERASE the hard drive (you may have to go out of your way to do this). Do not select anything that looks faintly like 'Recover Installation'. Format the HD as NTFS (Quick)
Reinstall Windows and activate it BY PHONE. DO NOT connect to the internet yet or your computer may be compromised AGAIN (20 minutes remember).
Install SP2 from the CD and restart.
Install the latest drivers from your burnt CD.
Install Kaspersky Antivirus.
Install FireFox and set it as the default browser.
ONLY THEN connect up to the net. First go onto Windows Update and install everything critical. Restart.
Your computer will now be clean and a lot faster.
Reinstall Office etc. and make sure it is updated properly.
Get an anti-spyware program and run it regularly too.
Make sure no more apps are installed than absolutely necessary and NO demos. How do you think they make thir money apart from spyware?
Work out how much time you have wasted, how much that time was worth to you and put an equivalent amount in a piggy-bank towards buying her an iBook.
Sorry, but there is probably no other way.
Mike