There is an old HP 1200 LaserJet printer in my office which I've shared on workgroup. My PC has windows 7 and workgroup has Windows 7 & Windows XP. I've installed latest drivers of this printer. I've connected printer by USB & it got configured on port Dot4_001. Some times it gives prints from my PC & sometimes not. Some Windows 7 PCs are able to print some not.
For windows XP some INF file is required. Please tell me what can I do so that other users can take prints.
I'll be very thankful for your reply.

I'm not sure if this is exactly the solution you need, but check out this answer (https://theonbutton.wordpress.com/2010/09/26/fix-hp-laserjet-1012-windows-7-driver-issues/). Especially look at the comments.

I hope this info gets you on the right track.
WallyH