~snip~
-snip-
Oh wait, at first I thought that if you will initialize at the first line of the code where the Vanitygen.exe is located(which is located at local disk D on mine). So this is what I did, first when opening CMD, CMD is locating at Local disk C so I initialize it to locate the files of vanitygen on D.
So I inputed:
D:
D:\Electrum\Vanity\Vanitygen.exe 1test
And I don't know how it worked but it did. So I got the result!
https://i.imgur.com/xnOOoeK.jpgThank you bL4nkcode, 1miau and wintersoldier! I hope I have enough merits to give you but I actually don't have sMerits now

. Anyway thank you all!
sample output too below
vanitygen64 -v -t 2 -k -o 15TQm.txt 15TQm
Prefix difficulty: 4553521 15TQm
Difficulty: 4553521
Using 2 worker thread(s)
Pattern: 15TQm
Pubkey (hex): 044910d643a7bf99c29630d503292643afa9290e6372a69752588f386b419a44b7
ed01593415780ad2daa3f81ce2cadc56888df8e6a94dbaf0ca28093dfb3a0ae0
Privkey (hex): 1B4111B2DBB6C569BA8A38A213C1180F506FEC029A1CDEC0DAAC1FFF51F21B71
Privkey (ASN1): 3082011302010104201b4111b2dbb6c569ba8a38a213c1180f506fec029a1cde
c0daac1fff51f21b71a081a53081a2020101302c06072a8648ce3d0101022100fffffffffffffff
f
fffffffffffffffffffffffffffffffffffffffefffffc2f300604010004010704410479be667ef
9
dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798483ada7726a3c4655da4fbfc0
e
1108a8fd17b448a68554199c47d08ffb10d4b8022100fffffffffffffffffffffffffffffffebaa
e
dce6af48a03bbfd25e8cd0364141020101a144034200044910d643a7bf99c29630d503292643afa
9
290e6372a69752588f386b419a44b7ed01593415780ad2daa3f81ce2cadc56888df8e6a94dbaf0c
a
28093dfb3a0ae0
Address: 15TQmLdViyMiBa5GWfgAPobki2jamh9mPS
Privkey: 5J2HkctUnXQrV7tdfR1rDK4Cu6BuCZHkTG6fVpzXaz8c3WeZfm5
[646.75 Kkey/s][total 6970113][Prob 68.4%][75% in 1.6s][Found 1] ^