Help! BSOD Every time I scan!

[lfcme]

Right so I have had Avast free for along time and seen that there was an update and proceeded to download from the softwares previous version
Once Avast 6 was installed. Restarted and proceeded to attempt a "Quick Scan"

Here was where the problem came.

Instantly the PC goes into BSOD and comes up with an unusual error that only happens with this method.

"BAD_POOL_HEADER"

Now I was reading on some forums that it can be a hardware problem. Although the BSOD never occurs at any other time.

I hav reinstalled and removed using the remover provided by avast and still the error does not cease.

Specs of PC:
Core i5 @3.20 GHZ
6GB RAM
64-Bit Win 7 Home Prem

Thanks in advance
Jamie 

[SafeSurf]

1.   What was the previous version of Avast that you had?
2.   What other security software do you currently have or did you have in the past on this machine including:
- Antivirus (AV)
- Firewall (FW)
- Trial versions of AV, FW and other security programs
- Other security software

- If they were in the past, how did you remove them (the vendor's uninstaller's tool or  another way)?

3.   Did you reboot after reinstalling Avast?
4.   Did you register Avast after reinstalling?
5.   Did you use the new Avast Uninstaller Tool: http://files.avast.com/files/eng/aswclear6.exe and remove ALL versions of Avast on your machine in SAFE Mode?

[lfcme]

Just before I answer I should just say that I have now rolled back my PC and it seems fine for now. Although I will install avast 6 again after I come back.