So we use Quickbooks to track labor, both internally and for our clients.  It's great in a number of ways-   the online interface is easy to use, we can easily create reports for our bookkeeper as well as our clients.

 I use the Outlook Integration tool-  it is mindless and allows me to tie my tracking right into my normal office environment without having to use a separate tool.

 Running vista (32 bit and 64 bit), I get "error 2738, vbscript module cannot be accessed" upon installation.

I have a sneaking suspicion this error is a result of running the unsupported Visual Studio 2003 from within Vista.

 I found the following technote that saved the day recently when i tried to update:  http://www.nitropdf.com/kb/article.aspx?id=10106&cNode=3D8W4P

1. Run Command Prompt as administrator
         1.1 Start Menu -> All Programs -> Accessories 
         1.2 Type "cmd"
         1.3  Right click on Command Prompt and select Run as administrator
2. cd %windir%\system32
3. regsvr32 vbscript.dll

The slight modification for my x64 got it up and running

1. Run Command Prompt as administrator
         1.1 Start Menu -> Search
         1.2 Type "cmd"
         1.3  Right click on Command Prompt and select Run as administrator
2. cd %windir%\SysWOW64
3. regsvr32 vbscript.dll

When i called last month, intuit had no documentation of this issue.    Hope this helps.