I have (had?) a Dell Dimension 2400. I migrated over to a new case and new socket 478 motherboard by ECS. I used the Dell CD to re-install windows using the "repair" feature, saving all my files and settings. One call to Microsoft got me an activation key and so I thought I was done. Wrong. Problems: 1. Windows boots/loads very slowly. MSconfig startup settings have already checked out. 2. I have a wireless network. THe PC connects fine, surfs the web for 10 minutes, then IE and Firefox cease to surf even though I maintain connectivity and good signal strength. A reboot fixes it but only for another 10 minutes. 3. Control panel crashes and closes every time I open it 4. I am back down to XP SP1, and can't maintain the internet connection long enough to download and install SP2 and most of the windows updates. Solutions: 1. Should I run a registry cleaner? 2. Should I run the repair install again? (will I be prompted for yet another activation key?) 3. Should I suck it up, buy a new copy of XP and start over? 4. What things should I check?