What to do with Avast results?

Hi! I am new to using Avast. I'd like some advice about what to do about results I get after the scans. Here is a list of the items it found, with my comments on them - on the recent scan I did:

PC health Problems list:
Your registry may be visible to others
Your folder "Users" may be visible to others
Your folder (a network sharing name I used to have - I no longer use network sharing in our home) may be visible to others. But I don't see it anywhere, and don't know how to find it as I don't see it in Network Sharing folder.
Your folder "Audacity" may be visible to others.

Programs slowing down your PC:
Digital TV tuner device registration application: I have no idea what this is and can't find it either. I never watch TV. Though I do listen to lots of music in YouTube. Windows Media Center Store update manager. I don't know how to turn that off. I never download music. I have VLC player on my computer too. AMD catalyst manager. I won't bother mention the smaller items which may be things I need, anyhow, such as IDT audio, as good sound matters to me.

Hi! Here is what it says in my system information:
OS Name Microsoft Windows 7 Home Premium
Version 6.1.7601 Service Pack 1 Build 7601
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name DEBBYJ-HPTURNIP
System Manufacturer Hewlett-Packard
System Model HP Pavilion g7 Notebook PC
System Type x64-based PC
Processor AMD A6-4400M APU with Radeon(tm) HD Graphics, 2700 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date Insyde F.05, 5/10/2012
SMBIOS Version 2.7
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "6.1.7601.24214"
User Name DEBBYJ-HPTURNIP\TurnipSeed
Time Zone Eastern Standard Time
Installed Physical Memory (RAM) 4.00 GB
Total Physical Memory 3.48 GB
Available Physical Memory 910 MB
Total Virtual Memory 6.95 GB
Available Virtual Memory 2.32 GB
Page File Space 3.48 GB
Page File C:\pagefile.sys

And here is your advice to me:
Please update your system specifications [at present virtually every category is identical!] in your UserCP => Edit System Spec setup. It will help us to help you!
Comment: I don't know how to do that. Can you explain more to me about how to do all of this? Where do I go in my computer to do this? I see no options for it under the Users folder in Control Panel, that I understand, anyhow. Other than what my username is and that I am set as an administrator.