Vista Ultimate IE7 downloads at snails pace!

Hello Gurus:

I recently installed Vista Ultimate on my pc and the downloads in IE7 are at
a crawling speed. I have a Comcast 6Mbs Cable connection and it is connected
to my PC via a Linksys WRT54G router. The connection to the PC from the
router is a wired one.

When I connect my Macbook to the Router (wirelessly) and run a speed test, I
can hit speeds of upto 5Mbps, but the Desktop Vista machine refuses to even
complete the speed test.

I updated all the firmware on the Router, did a system restore (like MS
Support told me to), but nothing helped.


I even got rid of the router and connected the PC directly to the cable
modem but again I cannot download at more then 12 Kbps / sec. I disable IPv6
from the sharing protocol as some websites suggested, but to no avail.

Any help would be appreciated.

Just an update, I tried doing the speed test with Firfox and that does not
work either. Speed test fails to complete because server times out.

I read some earlier posts and they said about removing some stuff. So this
is what else I have done.
1. Turned off phishing filter in IE
2. Uninstalled McAfee (both AW and Firewall)
3. Turned off Windows firewall.

All this still does not help. I still cannot get more than 12 Kbps download
whereas I have a 6 MBPS line working perfectly