WMP no longer shows wmv video, other strange anomaliesLocked
I have a HP notebook touchsmart laptop. Recently the hard disk started playing up so I had the hard disk replaced. When I got it back they had preinstalled Windows 7. Since that moment I have had odd problems with occasional crashes for no reason, either with the screen display suddenly turning into a chaos of random colours, or sudden blue screens and restarts. In addition, IE frequently displays an odd, very noticeable and distracting flicker, esp. with Yahoo mail. Finally, a wmv video file which displayed fine yesterday, after one of those system crashes has stopped displaying any picture in WMP, though I still get the sound. In Media Player Classic it displays but does not resize to fit the window as it used to.
I suspect all these problems might be related, or at least the last two. It strikes me that most likely there is a problem with video memory or drivers but I don’t know what to do about troubleshooting it. I tried some advice I found online which suggested running some built in WMP troubleshooter program that comes with Windows 7 but when I ran it, it gave me an error code and stopped working.