The application is not responding. The program might respond ...

Hello,

I think I have a virus on my PC, so I'll explain my problem quickly. Yesterday I noticed a significant increase in my PC's physical memory (50%), this morning I turned on my PC and it was super slow and I couldn't do anything, a message appeared (a message I had never seen before, a first!) in a small Windows window.

Microsoft Windows:
The application is not responding. The program may respond again if you wait, would you like to terminate the process?

And at that point, there is absolutely nothing to do, the PC is stuck.
So here I am in distress in safe mode.

I tried a system restore, but it didn't help at all :(

Anyway, here’s what I’ve already done (in safe mode):

[b][u]MalwareBytes:/u/b [url=http://www.pixenli.com/image1327614514027904000.html]Host your images! --- Pixenli.com/url

[u][b]ZHP diag:/b/u [url="http://cjoint.com/?BAAxihf8p4X"]Cjoint link/url

It's also worth noting that I had Avira as my antivirus but I've just uninstalled it to switch to Avast.

I have Windows 7 64Bit.

I hope to find help here, but I don’t think there should be a problem as you are all active and friendly ;)

Thank you in advance.