Updates past version 14 makes my pc run very slow

I am running Windows Vista and all updates after version 14 has slowed my pc down significantly. This last attempted has really funked it up. I keep getting the start-up repair. When I choose the start-up repair I get the blue screen of death. This is really annoying! I realize I'm using an older and slower version but I would think if you are updating Firefox you would make it compatible with all versions of Windows. Is there any way to fix this?

Also, you make it difficult to locate prior versions.

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