A coworker of mine had this issue. I found this web site: http://www.sevenforums.com/tutorials/2139-bubbles-screen-saver-change-settings.html and used the
registry hacks to create these entries in her registry:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Screensavers\Bubbles]
"SphereDensity"=dword:3e0e1847
"ShowShadows"=dword:00000000
"ShowBubbles"=dword:00000000
"Radius"=dword:42e3c08e
"MaterialGlass"=dword:00000001
"TurbulenceNumOctaves"=dword:000000ff
You should be able to take the bold text above, copy it into Notepad, save it as a .reg file, and merge it into your registry.
Decimal equivalents:
"SphereDensity"=1041111111
"ShowShadows"=0
"ShowBubbles"=0
"Radius"=1122222222
"MaterialGlass"=1
"TurbulenceNumOctaves"=255
This basically sets the screen saver to display fewer bubbles than the default, they're also slightly larger too, and they display on a black screen vs. the default of using your current desktop background. It produces a much calmer set of bubbles and
fixed her machine :)