Today I reinstalled openSUSE, however installer stalls during searching for
system files at 75%, and nothing happened. I think because I had already
installed openSUSE.

Unfortunately I have only one pendrive. However I recorded image with gparted
on the stick. Gparted was loaded into RAM. I downloaded the image with a
network installation and I wrote it to flash stick, during gparted live cd
session. Then I deleted the old partitions. I restarted my computer and then
openSUSE installer worked fine.