Vista - Dial-up Setup never worked with ANY MODEM!!!!

I have been using Vista 64 for a while, once I installed AT&T Global Network
Client for VPN, my all type of Dial-up stopped working (I had Blue Tooth
Device Dial-up with my Windows Mobile, Even if I try to setup a dial-up
connection using my Internal modems, it says is the modem connected, is the
modem switched on? – So I figured out right now, it can’t setup any dial-up
using any of those modems, Also, I have some tried with some other cell phone
modems, but none of them though when I query that modem, and diagnose it
shows that that modem exists and get responses from them.

Also, whenever I turn off – turn on my Wireless connection, the windows Host
process crashes, sometime it crashes without that as well. This is the second
time – I have installed Vista Ultimate 64 bit for my HP Pavilion tx1000, and
it seems like – I will have to either wait for Windows 7 or going back to XP
to trust MS OS. Had so much respect for Microsoft, but Vista seems like
telling me “Astalavista baby�, and VPN - Never worked!!!