To resolve this problem, follow these steps:
STEP 1 : REMOVE SID.BAK
1.Log on to the system by using an administrative user account other than the user account that is experiencing the problem.
2.Click Start, type regedit in the Start Search box, and then press ENTER.
3. Locate the following registry subkey:
Under the ProfileList subkey, delete the subkey that is named SID.bak.
4.Exit Registry Editor.
5.Log off the system.
6.Log on to the system again.
7.After you log on to the system, the profile folder is re-created.
STEP 2 : RESTORE YOUR OLD PROFILE
please note that new profile will be create after you remove the SID.bak file in registry. to restore your old profile without copy paste it to new folder, follow this step. let give example that your old profile folder name is PROFILE and your new one is PROFILE.PCNAME
1.open regedit and locate subkey;
2.under REG_EXPAND_SZ type, find ProfileImagePath name. search the data value contain %\Document and Setting\PROFILE.PCNAME (WIN XP) OR %\User\PROFILE.PCNAME (WIN VISTA AND 7)
3.change the data value that point to your old profile, %\Document and Setting\PROFILE (WIN XP) OR %\User\PROFILE (WIN VISTA AND 7)
4.restart your machine and done!
bacteria comment: make sure you point to right profile folder.