Cannot install programs on win 2003 standard server

[tom_the-confused]

Just upgraded my server to 2003. All has gone well but I'm having trouble
insstalling programs.

Two examples are pcanyware (11.5) and AVG file server edition.

AVG gets as far as asking what version you want installing, there is a pop
up window that appears for about half a second (don't know what it says as
there isn't time to read it) and then nothing happens.

PCanywhere starts installation then rolls back saying that setup was
interuppted.

I've enabled active content from cds and tried turning off the web Internet
Explorer Enhanced Security Configuration (first off completely then just off
for the administrator group) but this just stopped ie browsing all together,
just in case this was the issue.

Has anyone got any ideas how to overcome this?

Thanks
Tom