Hi,
Yes the latest SEPM version is 11.0.4014. In this case the hardwaare configuration is as follows
Pentium 4 CPU, 2.80 GHz, 512 MB RAM
The RAM needs to be upgraded to atleast 1GB. Please do remember that its the collective hardware speed of the machine that is responsible for the performance of the SEPM. You must be aware that endpoint is a bit heavy on resources and it also depends on the endpoint features that you have installed. If you have installed all features ...then with 512mb of RAM the system is bound to be slow.
Coming to the disk space issue you mentioned :-
"C:\Documents and Settings\All Users\Application Data\Symantec" have consumed 5.3 Giga bytes of disc space.
There are some files named like "000006A7", "00000AC8" etc..
of size more than 250 MB in the folder "Symantec Endpoint Protection" and
"C:\Documents and Settings\All Users\Application Data\Symantec\Symantec AntiVirus Corporate Edition\7.5\I2_LDVP.TMP\dec"
Upgrading to the latest version of MR4MP1a(11.0.4014) should resolve this issue. This happens due to the old files of SAV being stored. The new version of SEPM takes care of it.
Please check the following link and let us know whether it helped.
http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2008100216042048