Hello and welcome to the forum.
When I hear or see a post that begins with
This problem has just started
My immediate thoughts are.....
Try this
Right click the start button and choose Run and in the Run Dialog box type
rstrui
hit enter or click OK
Tick the radio button that says "Choose a different restore point"
Click Next
Check the box that says "Show more restore points"
See what you got and maybe choose one before "This problem has just started"
See if that helps.