Cant sign in to my photoshop element

Please let us know if you get a solution.

Also take a look at the posts by Jeff Wright, an Adobe employee,  found here.

I don't know if this will work in your situation but it is worth giving it a try:

Disconnect your computer entirely from the internet and activate offline, using the instructions found here.  (This link is from Archive.org so it may take several seconds to load.)