I realize this has probably been answered a thousand times:
I have a Lenovo laptop connected wirelessly to a Linksys router.  The
computer is set up for wireless already.   I am trying to connect my HP4385
so I can print wirelessly.  I uninstalled all HP from my computer and then
reloaded everything.  I should be ready to go, but nooooo!

Brian wrote:
You'll have to be considerably more explicit in describing what you did
and what the results were.  The HP Photosmart C4385 All-in-One Printer
(which appears to be what you are talking about) has built-in wireless
network capability. Usually, getting these to work is simply a matter of
putting the HP CD in your computer and following the on-screen directions.

To start with:

A. Did you make sure that the wireless adapter on your laptop was turned
on? (Many laptops have either a physical switch or a F-key combination
that turns the wireless radio on and off.)
B. 1. Do you have a wireless router?
    2. What make and model?
    3. If you have a wireless router, does your laptop access the
Internet wirelessly through the router?
    4. If not, how?
C. 1. What type of wireless encryption did you attempt to configure?
    2. On the router?
    3. On the printer?
D. What version of Windows are you using (including service pack level)?

Perhaps one of the how-to articles here can help:
http://h10025.www1.hp.com/ewfrf/wc/documentSubCategory?rule=1798&lc=en&dlc=en&cc=us&product=3651156&lang=en

automatic ad-hoc wireless connection?
Using WiFi Router As WAP?
Only seems to allow one wireless connection at a time
One laptop, multiple wireless networks, different settings...
Dell behaving oddly
WLAN Error: "The key is provided for me automatically" does not work
Wireless Network Setup Wizard.
hope this is the right group to ask this
Wirelessly connected to server but can't connect to Internet
Lack of ability to make up a wireless network WITHOUT an internet