Solution for slow QuickBooks performance is several areas, including opening centers, opening blank invoices, opening the Find window, saving transactions, and others. Explains that slow performance can have sevearl causes, and that many of these have been fixed in the most recent update.

Decribes how to update QuickBooks software with periodically released patches. Covers both in-product and manual update methods.  

Errors appear when starting QuickBooks: 00000 39057 (2007), 00000 38772 (2008),00000 38997 (2008), problems with qbregistration.dat file, or other. The "Loading" screen might appear briefly, but QuickBooks doesn't open.

You can change the credit card, billing account, and other information for your QuickBooks Payroll subscription.