You might have a buggy third-party program or a hardware driver loading at startup that is running as a service, and it is listed under an instance of svchost. Svchost is is just a generic host for other processes that are loading from DLLs.
Running the Tasklist /SVC command might help you sort out which file or program is using so much memory and/or processor time.
The only process that should be using a large amount of processor time is the System Idle Process, but the memory demands for this process are supposed to be low, such as 20K.
A typical example of a program that might cause a problem like this is a firewall, like the WinGate Internet Client. For hardware, a Visioneer USB Scanner. It could also be caused by spyware, or a trojan horse that has infected the system.
On my system, the instance of scvhost that is running a similar set of Services has a PID of 604, and this is what is listed:
AudioSrv - Windows Audio
Dhcp - DHCP Client
dmserver - Logical Disk Manager
EventSystem - COM+ Event System
helpsvc - Help and Support
lanmanserver - Server
lanmanworkstation - Workstation
Netman - Network Connections
Nla - Network Location Awareness (NLA)
SENS - System Event Notification
ShellHWDetection - Shell Hardware Detection
srservice - System Restore Service
TapiSrv - Telephony
Themes - Themes
uploadmgr - Upload Manager
winmgmt - Windows Management Instrumentation
This totals up to 12,960K, with 00 CPU usage.
I have three other instances of svchost. They each run one program, respectively: RpcSs (Remote Procedure Call), Dnscache (DNS Client), WebClient (Enables Windows-based programs to create, access, and modify Internet-based files). Combined, these add up to 9,844K, with no CPU usage.
RasAuto and RasMan are for my Remote Administration program, which is running as a Service due to personal preference, which is why you don't have these listed.
The basic differences between your system and mine are:
Browser - Computer Browser
Cryptsvc - Cryptographic Services
messenger - Messenger
Schedule - Task Scheduler
Seclogon - Secondary Logon
TrkWks - Distributed Link Tracking Client
W32Time - Windows Time
WmdmPmSp - Portable Media Serial Number
Wuauserv - Automatic Updates
WZCSVC - Wireless Zero Configuration
I don't see anything in your list that is a third-party service, or based on a DLL. But you do seem to have several unnecessary Services running that can eat up a great deal of memory. And one of them is taking up too much of your processor time.
Because of this, I suggest you edit the Administrative Services List. You'll find some excellent information on editing specific Services on each of these three websites: