Windows XP May Slow Down If Users Are Logged On with Fast User Switching
http://support.microsoft.com/default...b;en-us;312058
As to the DVD/CD: what software are you using?
Also:
In device manager go to the IDE ATA/ATAPI Controllers section and double
click on the channel where the CD is installed. Click on Advanced
Settings and and see what transfer mode the drive is in. Is it DMA or
PIO. If PIO that could be a cause for the slowness. If there were read
errors the system drops it from DMA to PIO.
Also some general sites:
http://www3.telus.net/dandemar/slowcom.htm
http://mywebpages.comcast.net/SupportCD/OptimizeXP.html