Question: The problem I have is that I only have one monitor which I use for my Windows PC, is it possible to connect a Raspberry Pi Zero to my PC via a USB connection and then use it like that?

So like a remote desktop connection only without Internet.

I do not have an Internet connection for my Raspberry Pi Zero, so using Putty or something like that is impossible.

Answer: 
I was able to connect to an enterprise wifi following these instructions:
<https://gist.github.com/chatchavan/3c58511e3d48f478b0c2>

I didn't need a radius server certificate or anything. Key things for Enterprise authentication (MSCHAPV2):

1. add this lines to your `/etc/wpa_supplicant/wpa_supplicant.conf` (edit as appropriate):

```
network={
        ssid="YOUR_NETWORK_NAME"
        proto=RSN
        key_mgmt=WPA-EAP
        pairwise=CCMP TKIP
        group=CCMP TKIP
        identity="YOUR_USER_NAME"
        password=hash:YOUR_PASSWORD_HASH
        phase1="peaplabel=0"
        phase2="auth=MSCHAPV2"
}

```
2. add this lines to your `/etc/network/interface` (edit as appropriate):

```
auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
    pre-up wpa_supplicant -B -Dwext -i wlan0 -c/etc/wpa_supplicant/wpa_supplicant.conf
    post-down killall -q wpa_supplicant

```
3. try bringing the network interface down and up again:

```
sudo ifdown wlan0
sudo up wlan0

```
4. The following error message should be ignored. It's a known bug upstream from Debian.

```
ioctl[SIOCSIWAP]: Operation not permitted
ioctl[SIOCSIWENCODEEXT]: Invalid argument
ioctl[SIOCSIWENCODEEXT]: Invalid argument

```
5. If there's no error, you should be able to see the wireless adapter connected with the following command `iwconfig`. The output will show the SSID and other connection info:

```
wlan0     IEEE 802.11bgn  ESSID:"YOUR_NETWORK_NAME"  Nickname:"<WIFI@REALTEK>"
          Mode:Managed  Frequency:2.457 GHz  Access Point: XX:XX:XX:XX:XX:XX   
          Bit Rate:72.2 Mb/s   Sensitivity:0/0  
          Retry:off   RTS thr:off   Fragment thr:off

```
6. You should check if you have an IP address with the following command: `ifconfig`. The wlan0 entry should have an IP address, like the following.

```
...
wlan0     Link encap:Ethernet  HWaddr XX:XX:XX:XX:XX:XX  
          inet addr:192.168.0.110  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:497 errors:0 dropped:32 overruns:0 frame:0
          TX packets:373 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:83237 (81.2 KiB)  TX bytes:60068 (58.6 KiB)
...

```
Finally found the answer here. Basically we need to downgrade the wpasupplicant to stretch version v2.4
<https://www.raspberrypi.org/forums/viewtopic.php?t=244731#p1498661>