Hi

With the wireless card enabled my touchpad on the laptop becomes erratic
i.e. it responds intermittently.

Can someone help

The laptop is an Acer Travelmate 291xci centrino.

TIA

Craig

Not much info to work with.  My guess(tm) is that some program,
process, daemon, worm, virus, or buggy driver is stealing CPU cycles.
Since you didn't disclose your operating system, I'll assume XP Home.

Do you have TWO wireless devices?  The Acer Travelmate 291xci laptop
includes an integrated wireless card.  Now you're adding another
wireless (WG511TGE) card?  Why?

Fire up the Task Manager (hit alt-ctrl-del and select task manager).
Go to the "Performance" tab.   With the machine at idle, the cpu usage
should be very very low (about 1-5%).  My guess is that you'll find
that it's running considerably higher than that.  If so, look at the
"applications" and "processes" tab and try to determine which
application or processes is hogging all your CPU cycles.  My guess(tm)
is that you have a worm or spyware that's detecting a wireless
internet connection and making the CPU rather busy.  I suggest
downloading and installing Microsloth Anti-Spyware Beta 1 which I've
found works much better than anything else I've tried.

On a different note, there have been several important updates to the
Centrino wireless drivers.  XP SP2 also adds considerable improvements
to the Wireless Zero Config drivers and program.  I suggest you update
both, but only AFTER you stabilize the laptop and remove whatever is
causing the CPU/mouse/whatever problem.

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