Files that can't be scanned are just that, not an indication they are suspicious/infected, just unable to be scanned.
Item 1 is in the Temp Internet Files folder and you could reasonably empty the temp internet files from your browser settings or use
ClearProg - Temp File Cleaner or
CCleaner - Temp File Cleaner, etc..
The others are in the C:\System Volume Information folder a part of the system restore function and are usually related to items you have at some point deleted (usually from a system folder) and system restore make a restore point for it in case you wish to reverse it.
If the archive really is corrupt the _restore points value is nullified so you could clear out your C:\System Volume Information folder and shave some valuable disk space if your system is running fine you can create a clean restore point and clear the rest.
Create a clean System Restore point:
1. Click Start, All Programs, Accessories, System tools, System Restore.
2. In the pop-up that appears fill in the radio button to Create a Restore Point
3. Click NEXT
4. Enter a useful name that you will remember if you need to find this again (Clean Restore Point)
5. Click CREATE
You now have a clean restore point, you should clear the old ones:
1. Click Start, All Programs, Accessories, System tools, Disk Clean Up
2. Click OK on the C: drive
3. Click the More Options tab
4. In the System Restore section click the Clean Up button
