Are you sure you're using the correct driver? It sounds as if you're not. TP-link (apparently) seems to be aware that their initial drivers didn't work well with Win7. Have a look Compatibility With Windows 7
Make 100% certain that the card is using the correct driver. Not a driver similar, but the exact driver.
Congratulations on finding an IRQ conflict. That's seriously impressive that anyone even remembers what they are. IRQ conflicts disappeared (mostly) with Windows 95, and they have been almost non existant with WinXP and on. People these days don't understand the joys of setting DMA 3, IRQ 7, I/O 03F6H-03F6H manually with jumpers on an ATA-33 ISA hard drive controller. That whole ****** card was a bunch of jumpers, and good luck figuring out the manual. Not to mention you'd have to edit Autoexec.bat and Config.sys with the appropriate information for certain cards.
The real pros could type that crap out manually. Setblaster a220 i5 d1 t4
I forgot the one for CD rom. MSCDEX ...something..
Anyway I'm getting off track here. Try making sure you're using the right drivers, it sounds like you're not. Thanks for the trip down memory lane