I have win 8,1

things i changed after stable system

deleted skydrive registry entries
installed acronis backup ( i activated scheduler but i disabled it ;problem still here )
i clicked on the taskbarflag saying (problems):: in my microsoft account i changed the security email
then in windows i was prompted please enter your password again :: after that problems began

evertime i store something on my desktop files / folder there are deleted in a random time
they just disappear and can be found nowhere

how can i troubleshoot this - its very wired