[BUG] icons blurred

[french user, bad english :o, sorry]

Hi, i’m new on this forum and would like to get some help cause my blender bug. Before (1 year ago), blender was working really good, slow renders but it’s normal with my prehistoric computer. And yesterday, i open blender to… blend :cool: but my icons was blurred. My drivers are updates and i tryied old (was working) and last version, but nothing changed. I can give you any useful document

<= a screenshot of my icons (blue box is a boost for my computer)