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#11
What was ironic here was finding several old XP programs, games that would install and run on the 32bit 7 but on the previous version's 32bit editions.. Backward compatibilty has been improved with 7 it seems!
If your av program has a firewall included or another active filter that is unattended that could explain some of the problems you have been running into. You could try those same links with the present software you have on the XP Mode disabled to confirm or rule it out. For the XP Mode I simply left that with the MS Security Essentials while the 64bit host has a retail software in use.
Another thing found was when performing a internet speed test on both the 7 host and XP Mode to find the 7 host fared far better at 18434kbps over the XP Mode's 12456kbps. In most circumstances the host will see the faster speeds while I also found a Linux distro being run on VirtualBox fared better with 15000kbps.
The primary purpose for the XP Mode however isn't for web browsing but an environment to keep old programs going long after upgrading out of an older OS.(2000, XP, Server 2003 mostly XP) The links posted before however should be looked over since those provide several steps for troubleshooting IE problems.