A small ammount of dust is fine. To be honest if those temps are real i would right now take your side panel off and keep it off untill you install a few decent fans. Both the CPU & HDD look to be overheating and the only thing that can lead to is broken parts, lose of files and Clocker getting excited, which i must confess is rather amusing.
Might want to replace the heatsink & fan with a more powerful and effective unit also, but don't do anything to it unless you know what your doing.
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