Kindle for PC on Windows Home Premium 64 freezes

Sometimes I am able to access the menu but it freezes at some point. If – sometimes – I am able to check for problems in the help menu, everything is green and ok.
Sometimes I can access one bought books, but cannot highlight a text. Or change the size of the font. I can mark the text, but when I try to highlight, the pointing hand turns into a hyphen. Cannot, in any way, add a note or use the copy function. However I can always use the built dictionary without any problems.
If I try to access the Library, most of the time it freezes and sometimes not. The reading process has been very uneasy to follow. If I do access one book, there is no way to come back to the Library and read another book.
Checked virus many times and nothing came up. This is a very strange behavior. Checking the Task manager and in Kindle line says it is running and does not show any problem. Everything I know was done, like install/uninstall, erase all traces of prior installation, install again as Administrator, run the installation or the Kindle program as an Administrator, deregister, register again, download books again and so on, following all instructions on Amazon site.
Kindle 1.8.3 System with 6 GB of memory I7 NVIDIA GeForce GT 425M with 1 GB of dedicated video memory that passed the stress test 300 GB of free HD Operating System and virus program completely updated.
Any help would be appreciated.
Thank you

You might want to check Event viewer to see what is logged there

To check for freezing/crashing you need to check several things.

Event viewer.

Type eventvwr in search and go to the windows log>application tab.
Look for errors. Errors have red in the left hand column.

Look for errors that say app hang, or app crash, or anything related to the problem.
When you find them either take a screenshot of them and upload them to us, or note the event ID and source codes and look them up in google. If you cant find them in google tell us what they are.

Thank you for your reply. In Event Viewer/Windows Log/Application there is no shown problem, even if Kindle for PC did stop responding a huge amount of times. Only one Yellow mark is shown in the Event Viwer and is related to Search. No red marks.

Seaside said:

Thank you for your reply. In Event Viewer/Windows Log/Application there is no shown problem, even if Kindle for PC did stop responding a huge amount of times. Only one Yellow mark is shown in the Event Viwer and is related to Search. No red marks.

Did you check the system, and setup tabs? You can upload the event viewer log if you like

Hope this uploaded Log file does help. This Gatherer Task category shows up many times and I do not know what is all about.