|Seems you're not alone in this - over the years...|
Rather than post numerous hits/references "out there"... suggest you do a google/yahoo etc.trawl (search) using:
XP desktop disappears
as the search term/string.
You'll get more than a few suggestions and apparent fixes...
Suggest you read a few carefully - before trying "any" of them...
And if/when you resolve the problem - perhaps (please) post back with how you dun it? Useful for others here (and "visiting" from elsewhere) to know in future?