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Yeah, do a system restore back to the day just before the last time you are sure it was running right. Sound and video drivers are often cause what you are describing.
Also some of the issues you have describe could be hardware issue, but only if a system restore to a know good day causes the same problems now.
I which case, use a "run from CD copy" of Linux like puppy linux. Then if it has the same problems it is most likely hardware.
Puppy linux is small and a cd copy will take only a few minutes to download, copy to a cd, and then boot your computer with it.

Also, now with in windows you can download AUTORUNS, a program microsoft was sort of forced to buy (embarrassment.. the whole story is sort of funny.) It is to turn off the non essential progams that run at startup.
Then just go it and un check everything that is not a system device. (Look at the name of who wrote the program beside the file..) Then restart and if it does not have any more problems you will know better what may be causing the issues.
Worse that can happen here it does not run at all in which case you go back in under a safe boot and recheck everything. It will function just like it did before.

You can beat this, remember it is just a stupid appliance running hard ware and software.. neither of which comes from men or women not much smarter than you.
Good luck, email me back or post here again for more assistance.