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Win 2008 R2 AD DC server internet speed bottleneck while other servers are fine?

On a small business network we have a simple Windows 2008 R2 server configured as the AD/DC with DNS, DHCP and Fileserver duties, and hosting our business apps and flat files.
We also have a VMware ESXi 5.1 server with an RDS server and a couple of other utility servers running virtually, all Win 8.1 or Win 2012 R2 as domain members. We also have up to 10 or more workstations connected to this DC.
We have a fast Mediacom business circuit that affords us up to 100/10 Mbps (when it's working mind you...).
Recently I found that the main Win 2008 R2 server had some freeware installed accidentally that were of the "Boost your machine  by letting us fix all the found problems type" (likely installed by a staff member that was doing something on the server).
After removing said 'freeware' programs and slapping the hands of the staff I've noticed that this server now has an internet speed bottleneck.
i.e... Speed tests are very slow from it while other servers or workstations test fast, and this speed restriction is evidenced when I connect to this server remotely also.

The local IP and DNS are all straight... Server is static, GW is our firewall, DNS is itself and loopback, workstations and other servers see this W2K8 R2 DC as DNS resolver, the DNS is config'd with Google & OpenDNS forwarders, Root Hints are all updated...

I'm rooting thru everything I can think of that could be causing this but haven't yet found a reason.

Anyone have a similar experience and fix ideas or just general ideas of what to look for that could be internally restricting this servers internet speeds!?
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Neopaladine
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Neopaladine
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Dirk MareSystems Engineer (Acting IT Manager)Commented:
install Chrome browser to test internet speeds. It is not recommended to browse internet via server OS

Also the freeware most likely caused more bad/wrong than good. Run sfc /scannow from administrative command prompt.

DirkMare
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Dirk MareSystems Engineer (Acting IT Manager)Commented:
More then enough information given to close the question.

DirkMare
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