[Shuie]

easiest way to clean it is boot from the CD and make sure to delete the partition. Then re-create your partitions and re-install.

Keep all of your data in a central data directory with your outlook .pst file and back it up often to a cd, dvd, or network share. Whenever the machine starts getting whacky, rebuild it and restore your data. Once windows starts acting up, its usually easier to rebuild the machine than it is to troubleshoot it.