Now that XP is no longer supported, I decided to change to W7. When I installed Office 2010 (32-bit, obtained by download), I thought that I might just as well install SP2. It failed repeatedly. Having looked here and elsewhere, I eventually found a solution
- it is all to do with the location of the installation files.
Step 1: run the Office 2010 installation programme again until it has extracted the files and you have the yellow window headed, "Change your installation of ..."
Step 2: using Windows Explorer browse to the folder, "C:\Users*your user name*\AppData\Local\Temp\OWPE476.TMP".
Step 3: copy the contents of this folder to the root of a USB stick.
Step 4: copy SP2 installation file to the same place.
Step 5: if you backed up your system before installing Office 2010, well done! Recover the system. (Going back to a restore point might work here too.) Otherwise start again from scratch!
Step 6: using your USB stick files, install Office 2010 by using setup.exe directly.
Step 7: run the SP2 installation file from the USB stick.
That took time and effort to work out - what a palaver!
In theory, an alternative approach is to use Windows Update, but persuading it to update other Microsoft products may take a similar degree of persistence.
Good luck!!!