What exactly are you downloading?
Have you checked the downloaded files folder? Can you tell if the files attempted to download?
Do you have administrative rights on the computer? Why are files set to read only?
Create another directory on the c: or d: called download or working. then change settings for download in the browser to the new directory then try downloading. Might want to even try creating another profile with admin rights and log in with that. try both.
what is it ya want to transfer? Everything from a browser to another? If so which one.
All you need to do is copy and paste the things you want from old account to new account. Use windows explorer to do this.
The profile itself may be corrupt and the only way to fix that is to create a new account. If paste is grayed out then most likely you didn't copy anything.
Can't delete old account without transferring files you need. If the files aren't important then delete the old account.