Question : Problem: Svchost.exe

svchost.exe using memory

Answer : Problem: Svchost.exe

Svchost is usually not a virus, and you will often find several copies of svchost running.
The bug appears to be related to the Windows Update service.
Temporary Solutions listed here, together with some good advice >

http://ask-leo.com/how_do_i_fix_this_high_cpu_usage_svchost_virus_or_whatever_it_is.html