using xp home when i try to watch a film from my hard drive the picture keeps freezing but just for a few seconds its like stuttering it also does it in the visualisations in media player when playing music and when playing games online also the computer has been shutting down and system restore wont work I also used registry cleaner I had 580 faults fixed them still have same problems

Alot of testing you can do...
What Registry Cleaner did you use?
Were things working OK before?
Any new hardware/software/drivers?
Is this an old computer? Have you opened it? Cleaned it?
Do you know the Graphics card? Do all the fans work?
Do you scan for viruses & malware?

Also: look in your Event viewer: rt. click My Computer then click Manage then Event Viewer.
Or: Administrative Tools/Event Viewer or Start/Run/ eventvwr
Open the system as well as the application tabs & look for X errors. Click error line for details.
Post back the source & event id especially of errors that seem to coincide with a crash.

Also: rt. click My Computer then click Properties then Advanced then Startup and Recovery Settings then unclick Automatically restart

Also:

Go to start | search (type in) .dmp
Note the location of your latest .dmp file.

Then:

1) Download and install the
Debugging Tools from Microsoft
2) Download and install this
debugwiz
3) Open the Wiz & Browse to, or paste in the path to, your latest .dmp file.
4) After the Wiz creates a Text document attach it back to this thread.