Batch File Account switching!!! HELP NEEDED

[instiinct 🍌]

So, i created a batch file that kills the running process tree of steam.exe and then relaunches steam with login parameters, In essence, it is basically killing your main account, then logging in the your alt. So far the taskill works gr8. It will kill the process tree and do it's job perfectly, as for the relaunching of steam.exe... well. Heres the script im currently working with, Ive also included a link that shows what error message i get when trying to run steam from the batch file.

taskkill /t /f /IM "steam.exe"

start C:\Program Files (x86)\Steam\Steam.exe -login USERNAME PASSWORD
pause

Error message i receive: https://gyazo.com/49a0776019d37a2c790db423e8ded618

Please help. It should be straight forward but it simply isnt.
Thanks in advance

[ReBoot]

1. Its start "" Path
2. If the path contains spaces, enclose it in ""
3. You should tell Steam to exit itself, wait a couple seconds and then kill it

[instiinct 🍌]

İlk olarak ReBoot tarafından gönderildi:

1. Its start "" Path
2. If the path contains spaces, enclose it in ""
3. You should tell Steam to exit itself, wait a couple seconds and then kill it

So how would it look? if you could just paste it in that would be lovely!
Thanks :)

[ReBoot]

Not right now. Im on my phone and typing commands is a PITA. Write me an email @ [e-mail], ill fetch it this evening and will copy you some of my batching.

[instiinct 🍌]

Okay, thanks man. I appreciate it!