Pull the Cheech and Chong bit on her: when she starts asking for Windows 98, you start asking her for it.
"Yo, it's me Dave, open up - I got the stuff."
"Dave? Dave's not here."
"No man, this is Dave, open up - I got the stuff!"
"Dave's not here."
...
"I need Windows 98."
"Windows 98? Windows 98 doesn't work here."
"No, I need Windows 98 installed on my computer."
"Windows 98? My computer runs on Windows XP."
"NO!!! I need Windows 98 on MY computer."
"Windows 98? .... (pot induced pause)."
"Hello?"
"Hello."
"About my Windows 98..."
"Windows 98? No, I run XP."