This could be caused by a corrupted Windows user profile account. The best way to tell is to log into Windows under another user profile and attempt to install. If the product does install, you should rename your user profile and then create a new one.
Instruction for this is beyond the scope of standard customer care that iolo technologies provides. We have listed Microsoft and third party resources below which will instruct you step-by-step on creating a new user profile account.
Fix a corrupted user profile in Windows 7
Create a local user or administrator account in Windows 10
Corrupt User Profile: Fix for Windows XP, Vista, 7, 8, 8.1, 10 (NeoSmart Knowledgebase) https://neosmart.net/wiki/corrupt-user-profile/#Symptom_1_8220User_profile_cannot_be_loaded8221_error_screen_on_startup