Hard disc stops and computer (Satellite Pro AS200 PSAF4A) Crashes?

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Hello

I recently had to re-install Windows Vista on my Laptop because I had an undetectable virus that attacked Windows and rendered it useless.
Before then I had many, many start-up errors and windows crashes but all of which were avoidable or fixable. After the re-install I noticed the stability of windows was much better until recently.

I have not changed any settings or anything what so ever on my Laptop that could affect performance in any way but I am having new problems occur.

If I have my computer running, performing basic tasks for a few or more hours I notice the performance drops and suddenly my computer will completely stop responding. The disc doesn’t show any sign of life after this point and its only solution is a "Disruptive Shutdown".
This shows up in the Reliability and Performance monitor as just that, there are no errors shown before it and nothing is done after.

I have also noticed if either windows defender or my other virus protection runs a system scan my performance is reduced to the point where I can not perform as simple a task as open an explorer window. This also results in complete non-responsiveness. This never happened before about a week ago and now it happens every time.

I try to watch video and it lags to the point where a 30 second video is spread out over about 5 minutes and the audio isn’t in sync at any point.
My computer has the ability to perform these tasks and much more but doesn’t seem to like it anymore.

Both of these started within the last few days and there is no obvious reasoning behind it. My CPU idle is still the same, no new processors added, no settings changed and nothing broken.

Is there a reason why this might be happening and is there a fix for either of these problems?
 
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