Ue4 project launcher slowing my pc

Hi
Every time I try to open my project the whole pc gets slowed down and the UE4 project launcher stuck on 95% and this is happen to all my project between 4.24 -4.26 except one and its also vers 4.26.

I sent UE4 tickets to Epic but I still have no answers.

I would really appreciate any help here

Thanks
A