i just want to play a mini medical dvd and don't know how

Does your PC have a DVD drive in it? If so, just put the DVD disc in and it should open a window asking you what program you want to use to play the DVD with. I don't know what programs you have ion your system so I can't tell you which one to chose but Windows Media Player is not the one you want.

WinDVD, PowerDVD are tow that come to mind that may be installed.

If that doesn't help, please go to PcPitStop and run their scan then post the link back here:

Please Run the PCPitstop Full Tests, here: PCPitstop Full Tests

You must use Internet Explorer as it needs to install an ActiveX program.

Note: Vista users with UAC must first Right-click IE - Select "Run as Administrator"

If you haven't already registered, Click - Sign up now! (left hand column in User Login)

Register and create a password
Accept the ActiveX component to allow your machine to run the Full Tests
Registering and accepting the ActiveX are both SAFE and FREE.

The Full Tests take less than 5 minutes for most machines.

Once you have your Results, please post the URL (the http:// stuff) back here into this thread for review.

Note: Vista users, please close your instance of IE "Running as Administrator" after you are finished reviewing your Results.

Caution: During the testing of Video Adapter, a variety of patterns, shapes, colors and text are “flashed” onto the users monitor screen. In the many thousands of daily uses of the PCPitstop Full Tests over several years, two individuals who suffer epilepsy experienced discomfort and temporary dizziness when viewing the flashing patterns.

If you know that you are susceptible to photo driven seizure, please look away from your screen during the Video Adapter testing sequence.

Note: The PCPitstop Full Tests Results is a free service, but is supported by various paid product advertisements for utilities that "could" remedy the OP's problem.

Since this site is a "free-help" forum, we do not recommend or endorse purchase of automated utilities, and will assist you in manually correcting any problems and settings necessary to optimize your machine's performance. Ask your questions here. We'll help you walk through any necessary steps.