Thanks for the replies.

I have copied the Picasa images to an external HDD.
What to do next?

How to delete all Picasa folders at my PC?

If I take a look at E: at my PC, it lists:
folder SRECYCLE.BIN (empty)
folder images (36,6 GB)
file hd2811.tib (3,99 GB)
file hd2812.tib (3,99 GB)
file hd2813.tib (3,99 GB)
file hd2814.tib (597 MB)
Huh, what’s tib?

Seems that Picasa puts images at E:

I shall be looking forward hearing from you again, thanks.

Best regards, Hermie