Win Server 2008R2 64 bit running 100%CPU

[tomc]

Hi
This is the physical server we have.
1 INTEL R2308GZ4GC 2U SERVER
2 INTEL XEON E5-2650 2.00GHZ/20MB
4 8GB DDR3-1600 REGISTERED W/ECC
1 LG GT80N SLIM DVD BURNER SATA
1 INTEL RMS25CB080 8-PORT SAS MODULE
1 INTEL AXXRSBBU9 SMART BATTERY B/UP
2 SEAGATE CONST ES3 2TB SATA3 3.5"
Win Serv 2008R2 setup with 2 CPU 7Cores each, 28GB Ram
Only VM running on the Physical Server.
Running ProxMox 3.4-15/e1daa307.

We are running An automation program (Automate various tasks) called +PRes Automate
It runs the .exe, PA.exe *32 in Task manager with 28 instances.
When it starts it uses all cores of both CPU's this is OK until the cores max out at 95 to 100% +.

What continues to happen is PA.exe using all cores Windows 2008R2 grinds to super slow and jobs time out and fail.

Will updating the Virtio drivers help?
Any ideas?

 

[tomc]

Three Cheers
Problem fixed, Turned off Balloon and used fixed memory size.
Server now runs at peak times 50 to 60%

Tom