My friend has a laptop of lenovo 4151/200 comes with windows vista,My friend got corrupted it and i want to reinstall it they didn't given any dvds or cds with it then how can i install, that laptop had 2 drives 1 is c,another one is labeled as backup and size is 10 gb does all the files are in the backup drive if so please tell me how to recover.

you need to be more specific as to the model and all that. find lenovo home page for your area and then click find the support tab and look for downloads/manuals and insert the model and then download the manual. the information you need is in there!