What is the c: prompt command for a factory reset on a irulu windows 7 tablet?

If you want to delete index.dat, you can try this method:

1. Restart the computer and go to "Safe Mode with Command Prompt"2. After that, type cd.. as many times as needed to get to the root of C3. Then type: del index.dat /s and type shutdown –r

The system should restart normally with a new index.dat file

Hope this helps!

Source: What is the c: prompt command for a factory reset on a irulu windows 7 tablet?