Everytime I start up my computer Avast pops up saying it has blocked an attack, when you click on more info its marked as:
type: Mal
Location: C:\Windows\System32\svchost.exe
Url: (Always different everytime)
iv scanned my computer using avast, malwarebytes and some others but they find nothing??? help 
LOGS Atached
Where are the log files we need ?
See the top of this forum.
how to I attach my logs?
IV Posted Loggs Now if someone can help much appreciated
Let me know if this stops it
CAUTION : This fix is only valid for this specific machine, using it on another may break your computer
Open notepad and copy/paste the text in the quotebox below into it:
CreateRestorePoint: BHO-x32: No Name -> {451C804F-C205-4F03-B48E-537EC94937BF} -> No File Handler: WSWSVCUchrome - {1CA93FF0-A218-44F1 - No File 2015-06-13 11:32 - 2015-06-13 11:32 - 00000000 ____D C:\ProgramData\boost_interprocess EmptyTemp: CMD: bitsadmin /reset /allusers
Save this as fixlist.txt, in the same location as FRST.exe
https://dl.dropboxusercontent.com/u/73555776/FRSTfix.JPG
Run FRST and press Fix
On completion a log will be generated please post that
im sory im so confused I cant work this out do I save your text over the top of my text?
i think I done it…
after clicking fix it propted a restart and no window was shown on startup so do you still need a log posted? if so do I have to re run frst?
Is this what you was after??
You should be clean now … Can you confirm the alerts have ceased
they do appear to no long be showing! thanks for your help!
Subject to no further problems 
I will remove my tools now and give some recommendations, but, I would like you to run for 24 hours or so and come back if you have any problems
Now the best part of the day ----- Your log now appears clean 
A good workman always cleans up after himself so…The following will implement some cleanup procedures as well as reset System Restore points:
Remove tools
Download and run Delfix
Select the options as shown
https://dl.dropboxusercontent.com/u/73555776/delfix.JPG
Now that you are clean, to help protect your computer in the future I recommend that you get the following free programmes:
Update and run weekly to keep your system clean
Click on the link above to be taken to Unchecky.com
click the very large Download button.
click Save
Click Open folder
Right click on the Unchecky_setup and choose to Run as Administrator
Once open click the Install button.
Then click on Finish
Unchecky is now installed and will help you keep unwanted check boxes unchecked, this is a fire and forget programme 
It is critical to have both a firewall and anti virus to protect your system and to keep them updated.
To learn more about how to protect yourself while on the internet read this little guide Best security practices Keep safe 