Join Date: May 2004
Location: Wilmington, DE
Bikes: 2016 Hong Fu FM-079-F, 1984 Trek 660, 2003 Specialized Hardrock, 2004 LOOK KG386i (RIP), 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2016 Islabikes Beinn 20 (son's)
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Yes, but some caveats apply. First, what size threaded fork did your 7100 originally come with? If it came with a 1" threaded fork and you bought a 1 1/8" threadless fork, you are out of luck.
If it came with a 1" threaded fork and you bought a 1" threadless fork, you only need to buy a new threadless headset and stem. Same applies for 1 1/8" threaded to 1 1/8" threadless.
If it came with a 1 1/8" threaded fork and you bought a 1" threadless fork, you can get a headset that will adapt the smaller fork to the larger headtube.
If you didn't catch on though, you won't be able to keep your original adjustable quill stem. However, there are plenty of threadless adjustable stem that should give you the same adjustability.