Hi Steve, first and for all, you only need to have one AV installed at a time. Since you bought AVG, I'd recommend to reinstall the other two (avast and MSSE) and then try again.
The reason for this is that if both products have their automatic (Real-Time) protection switched on, then those products which do not encrypt the virus strings within them can cause other anti virus products to cause "false alarms
". It can also lead to a clash as both products fight for access to files which are opened again this is the resident/automatic protection. In general terms, the two programs may conflict and cause:
- False Alarms: When the anti virus software tells you that your PC has a virus when it actually doesn't.
- System Performance Problems: Your system may lock up due to both products attempting to access the same file at the same time.
If, even after uninstalling all other AV's and after reinstalling AVG you still have problems, I recommend you to contact AVG, since you have the paid version you should get some support from them with this specific problem.
"Now faith is the substance of things hoped for, the evidence of things not seen."
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Malware analyst @ Emsisoft