Nothing evident there … I think Avast is hitting on the partition 4 due to the size. Although I would expect this partition to be hidden and active if it was bad

+++++ PhysicalDrive0: (\\.\PHYSICALDRIVE0 @ IDE) TOSHIBA MQ01ABD075 ATA Device +++++ --- User --- [MBR] 0b11fc6025f3978bb813d9a76c5b2cfc [BSP] b8996950a1d301798fab0fb61d2dde23 : Windows 7/8 MBR Code Partition table: 0 - [ACTIVE] ACER (0x27) [VISIBLE] Offset (sectors): 2048 | Size: 1500 Mo 1 - [XXXXXX] NTFS (0x07) [VISIBLE] Offset (sectors): 3074048 | Size: 701592 Mo 2 - [XXXXXX] NTFS (0x17) [HIDDEN!] Offset (sectors): 1439934464 | Size: 12311 Mo 3 - [XXXXXX] NTFS (0x07) [VISIBLE] Offset (sectors): 1465149152 | Size: 0 Mo User = LL1 ... OK! User = LL2 ... OK!

Could you go Start > Run and type in the following command followed by enter :

compmgmt.msc

In the page that opens select Storage > Disc Management
Then take a screen shot of that page and attach it here