It may be an installation of a program has caused the problem. More and more of software come with attachments, causing problems. Sometimes Windows updates cause more problems than they solve. Since it has obviously been happening for half a year now, it could be hazardous to use a restore / recovery point, it would take you far back, and you would loose installed software. To start with, I would
1. Run a total and thorough virus scan, plus Malwarebytes,
http://www.malwarebytes.org/2. Check for any unknown programs installed, uninstall those you don't recognize, choose listing according to date
3. Reinstall DirectX - DirectX is uninstallable, but you can install it again --- well, it can be downgraded, through some labor...
4. Download and install and run CCleaner,
http://www.piriform.com/ccleaner, run it with default settings --- of course, check the settings
5. Defrag your disk(s)
Preferably reboot after each step.
By the way, which OS do you have? And Service Pack? Computer specs, although I don't think that is the problem. And whatever you reply, please don't tell me
I have no virus or other baddies. You should also have all patches for Morrowind installed,
http://morrowind2009.wordpress.com/