Quickbooks loads slow in XP

I have a client that used to run QB's 2003 and 2004 in Windows 98.   We upgraded her PC with a new hard drive and 512MB RAM.  We loaded windows xp on it and reinstalled all her applications.  

We then reinstalled Quickbooks (both versions - she is an accountant and needs to run multiple versions for her clients).  
When you open quickbooks the cursor has the hourglass next to it, then you wait, then the desktop icons flash and the hourglass goes away, then you wait some more, and eventually quickbooks opens.  There is no company file associated with Quickbooks at this time because its a new install (QB's tech support said that the file might be too big but this is not even opening a file, its just opening the program)

It did not open this slowly in Windows 98 with less RAM and a hard drive that only had a 1/4 of space left on it.

I spoke with Quickbooks and they gave me 2 things to try - open the reboot.bat file (that didn't work) and check that the compatibility mode is turned off (didn't work either).  She is not running it in multi user mode so that's not it either.  

I have quickbooks and am running Windows XP and have not had this issue.

Any suggestions??  I can't seem to find anyone else that has this issue.