For a while all seemed Ok after I closed thread http://www.sevenforums.com/general-discussion/273474-mouse-pointer-freezes.html
and subsequently updated the BIOS and a number of drivers, using either Dell's or manufactuerea' download sites.
I also, of course, made sure I had Firewall and Antivirus installed.
Trouble seems to have arisen, however, in the last couple of days, as can be seen...
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