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I'd start off by trying out the NoHatsMod by bgum and installing all of the addons with it. I notice that you only have 4GB of memory, so it is possible that the cosmetics in this game are filling up your memory extremely quickly. If the mod doesn't fix it, then it could be something that could be filling your memory quickly, thus causing TF2 to crash.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.