When installation or network problems prevent the software from locating the proper drive path, an error known as "Invalid driver letter in QuickBooks" appears. This mistake impedes workflow by preventing access to company files. Reinstalling QuickBooks or confirming and adjusting the drive letter designations are usually the first steps in fixing it. Give us a call at +1.833.802.0002 if you would like to talk with a QuickBooks support specialist right away.