Avast is using a lot of my rescources stopping me using video & internet browser

[REDACTED]

I have had to stop avast doing updates automatically as the program stops me using my browser and videos online.  So how can I reduce this problem.  I have not a bad computer 64bit 4GB ram
System Manufacturer   Gigabyte Technology Co., Ltd.
System Model   GA-MA74GM-S2
System Type   x64-based PC
Processor   AMD Athlon(tm) 64 X2 Dual Core Processor 6000+, 3000 Mhz, 2 Core(s), 2 Logical Processor(s)Installed Physical Memory (RAM)   4.00 GB
Total Physical Memory   4.00 GB
Available Physical Memory   1.73 GB
Total Virtual Memory   8.00 GB
Available Virtual Memory   3.97 GB
Is there something I have set right for this program to slow me down and not allow me to view the internet?
Thanks for your help

[Staticguy]

What Service Pack is installed>
Operating System? It's 64bit, but what is the OS? Windows 7,8,10?
What previous antivirus did it have prior to Avast?

Have you tried a repair of avast via add/remove?

[REDACTED]

Thanks for your reply - its Win 7 64bit.  And I have had Avast for years now.  But I did recently reload Win7 and restarted the whole process again.  Never had this problem before.  I have knocked anything out that is greedy like Windows media and other software that isn't relevant to the operating system.

That is it.  I haven't done anything to change avast.  except now I have put the updates on manual load up which I will now have to do once a day