PC always freezing/crashing - need help (+rep)

[Special]

Hi

I recently got a PC from my sister which she said i could have

It was running really slow so i recovered it to factory settings

After the recovery, there was a lot of updates (around 150) so i installed all of those and they are all up to date

I even downloaded DriverDetective and updated all of my drivers

The problem is still persisting, when a program like Habbo is running it crashes for about 1 minute every 5 minutes, if im on Habboxforum and say a google page it's fine.

What the problem? I hardly have any programs because of the recent recovery, all drivers up to date as well as all updates.

All helpful answers will get a +rep or 2 thanks for the help

[Grippz]

What is the operating system and how much RAM is in the computer?

[N!ck]

Turn off. Un plug. Open it. Clean all the dust off everything and out of the heatsinks. Put the side back on. Plug in. Turn on.

[DrLacero]

Turn off. Un plug. Open it. Clean all the dust off everything and out of the heatsinks. Put the side back on. Plug in. Turn on.

Nota Bene: Do not use a vacuum cleaner.

Does it crash when you're doing anything specific or using a lot of system resources?

[Markeh]

Bear in mind Habbo does use quite heavy system resources. On my HP it can use over 700Mb of RAM when loaded in Firefox.