www.blackviper.com/WinXp/servicecfg.htm windowsXP startup speedup.
www.sof32.com/download-BootVis.19687-5.html find XP startup hangups.
http://oca.microsoft.com/en/windiag.asp random crash diagnosis tool
www.nu2.nu/pebuilder if Xp won't load . create a bootable CD.
once downloaded and unzipped into a folder called pcbackup, next copy all the files from from your installation CD into the folder on your hard disk apply SP2 to these files by typing id:\xpsp2_en_x86.exe -s c:\pcbackup
now run pebuilder.exe and enter c:\pcbackup, this builds an ISO image that you can burn to a CD-R.
check for corrupted system files and fix them
START,RUN,SCF/SCANNOW
check for hijacked browsers
www.definitivesolutions.com/bhodemon.htm Convert AVI/MPG to DVD quality files
www.videohelp.com use TMPEG Encoder to convert files to MPEG PAL Layer 2 format then use TMPEGenc DVD Author to create chapter menu's etc, and create the VOB's from the MPEG files created in step 1 finally burn the VOB's to a DVD with nero.