do you have really high cpu and memory usage from scvhost.exe in task manager?
You should have someone who knows more investigate this but I ran your log through an analyzer that points to 2 things why your pc might be slow:
C:\Windows\system\svchost.exe - This entry is not running from the System32 folder, so it is probably nasty.
Possibly nasty! According to our database this process runs normally in c:\windows\system32\!
O4 - HKLM\..\Run: [SVCHOST] C:\Windows\system\svchost.exe - Must be fixed! Added by the DLOADER-EV TROJAN! Note - this is not the legitimate svchost.exe process which is always located in the System (9x/Me) or System32 (NT/2K/XP) folder and should not normally figure in Msconfig/Startup!