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. Especially look at the comments.

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