Outlook soooooooooooooo sloooooooooooow . Why?

[#1]

For the last week or so my Microsoft Outlook as been misbehaving, No problems sending (although I don't do that often), but ages to receive.
E-mail has always been pretty quick to appear, may be 1 per second, now it's about 1 per minute which is taking ages. I know this isn't a major problem, but it is annoying
Everything else is working fine, so any help ( in simple terms) would be appreciated
P.S. Does sometime run fine, so not a continuous problem

[#2]

Three questions
Outlook or Outlook Express and if Outlook which version
Have you checked line speed when you have the problem
Are you connecting to the router by wireless

[#3]

Top left hand corner of the screen says Outlook (the PC is about 4 years old)
How do I find out which version I have?
Line speed is fine (or at least the internet's working at it's usual lightning speed). Upgraded to PlusNet Extra Fibre just before Christmas & it's wireless.
Not sure if this is any help?
I have AVG (the paid version) and run a weekly scan & nothing's turned up 

[#4]

Click on Help then  About is the usual route

[#5]

Sorry...........I'm a complete novice at these things.
When you say click on Help..........Help where?
And what is About?

[#6]

see picture

[#7]

See my attached images.
Click on the word 'Help'
On the list click 'About Microsoft Office Outlook'
The version is shown as in my second image below.
Edit: Jim got in first.

[#8]

This may be the problem http://forums.avg.com/us-en/avg-forums?sec=thread&act=show&id=179280

[#9]

Looks like you are right about the AVG issue............I'm talking to them now.
Cheers