Please help: svchost.exe using nearly 100% CPU at startup!!!

Lately at start-up I found out that svchost.exe was using close to 100% CPU
for perhaps the first 2-3 minutes. It eventually settles down, but I just
find it annoying that I have to wait up to 5 minutes before using my computer.

I used Process Explorer and found out that this thread:
ntdll.dll!RtlAllocateHeap+0x18c in svchost.exe was using all the CPU, but I
don't know what it does, what it's linked to, and whether or not it could be
safely terminated.

Thanks in advance!