Are these computers 64-bit by any chance? - I ask because SP2 is obsolete on anything but XP x64. Read here: https://community.mcafee.com/docs/DOC-1315 and how to install SP3 here: https://community.mcafee.com/thread/2007
If they are x64 then MVT doesn't support it anyway as it is designed for home products which don't support that version of XP.
If they are 32-bit and are using the home products then they are out of date and probably MVT will work once they are updated.
Thanks For Your Help.
You're welcome. Actually I have just realised where you are posting from and you should read this, sorry ;-(