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A workaround for the final mission "A Revenger's Tragedy" in GTA 4. If it doesn't work for you, there's always the "FRAPs" solution. (Google fraps gta4 helicopter). Re-assigning keys did NOT help me. Anyways, here's what you can try:

Pause the game before the jump

Press (Alt) + (Tab) to switch to Windows and
right-click on the taskbar to open the task manager

(alternatively open the task manager with (Ctrl)+(Alt)+(Delete))

Right-click on the task GTAIV.exe
and select "Set Affinity..."

Deselect all processors but one

Click on "OK", unpause the game and
jump to the helicopter

Quickly smash the (spacebar)
as if there was no tomorrow

Pause again and in the task manager
switch all the processors back on

Back in the game, steer the chopper
with (w), (Num-2) and (Num-8)

Repost of https://www.reddit.com/r/Amd/comments/hbxn6p/completely_and_absolutely_correct_use_of_your_64/
which is repost from bilibili

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