That is to be expected.
However, many didn't know to update drivers from Dell.com (no button in the OS does this) or that the hard disk DMA setting may be in PIO mode. Here's the link about this issue -> http://www.microsoft.com/whdc/device/storage/IDE-DMA.mspx
Notice you must set it to PIO then back to DMA? Read the directions. This is not optional for those experiencing slow hard disks.
-> One of the downsides of the XP Upgrade is all the clutter that is left behind. There is no list of what to remove. Hence you will read other posts that propose that a clean install is better. It is, but can strain the owner more.
Bob
We have a Dell Dimension 8100 Series, Pentium 4 Processor 1.7GHz and have recently upgraded from Windows ME to Windows XP. When I run a virus scan, it takes much longer and it seems to be due to checking files labeled undo/backup. Actually, the whole system runs slower since the upgrade to XP.
My question is this: Once you know that the upgrade worked and things are running smoothly, are there files that should be deleted?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic