Originally Posted By: rationull
There's a section in this page:
http://www.howtogeek.com/165472/6-things-you-shouldnt-do-with-solid-state-drives/
Titled "Don't use Windows XP, Windows Vista, or Disable TRIM"
Migrating Windows XP to the SSD, you could end up with your partition not quite aligned correctly, and this and the lack of TRIM support (TRIM is a cleanup feature for deleted files, to put it simply, which prevents drive performance from degrading with use) mean that you may not be able to extract the drive's full performance potential.
Another thing to consider is that Windows XP does not get security updates anymore and is slowly losing support from third party software. I generally advise people to be running at least Windows 7 if possible at this point.
That said, if you get a cheap SSD and put it in this computer as-is, cloning the drive over, the machine will be MUCH faster and nicer to use, regardless of these disadvantages.
When I cloned my hard drive to a SSD on Windows 7, the SSD was not aligned right. Been a while back, but I think I used Mini Tool Partion Wizard Free to fix that problem.