Ron has an HP Windows 7 tablet, but when he uses it, the windows disappear for a few seconds. Leo says it sounds like a "stealing focus" problem. Software could be putting up invisible windows. He should close every program except the one he's using. Make a note when the issue gets better.
The chatroom says an app called Gladinet caused it. Another says Bluetooth causes it. Another possibility is the audio mixer software. Avoid toolbar apps, and see if a bad printer driver may be causing it. Roboform could also be doing it, since Ron installed that. There's a ton of issues that could be causing it.
Here's a Microsoft Answers post on it.