Rootkit Detected in Sandbox\Safezone unable to delete

Hi I ran a full scan on my system this morning, and I got the following results.

C:\avast! sandbox\S-1-5-21-3163310351-259726369-2821834488-1002\C\Uses\MY\AppData\Temp\CRX_DF399A9B283A\GoogleUpdateSetup.exe

C:\avast! sandbox\S-1-5-21-3163310351-259726369-2821834488-1002\C\Uses\MY\AppData\Temp\CRX_DF399A9B283A\ChromeRecovery.exe

Both registered as High threats, Rootkits and Hidden files.

I’ve tried to delete them using avast but had no luck, any help would be gratefully recieved.

aswMBR version 0.9.9.1707 Copyright(c) 2011 AVAST Software
Run date: 2012-12-17 13:48:13

13:48:13.247 OS Version: Windows x64 6.1.7601 Service Pack 1
13:48:13.247 Number of processors: 4 586 0x2505
13:48:13.247 ComputerName: MY-PC UserName: MY
13:48:16.960 Initialize success
13:48:17.085 AVAST engine defs: 12121700
13:48:22.342 Disk 0 (boot) \Device\Harddisk0\DR0 → \Device\Ide\IAAStorageDevice-1
13:48:22.342 Disk 0 Vendor: ST950042 D005 Size: 476940MB BusType: 3
13:48:22.389 Disk 0 MBR read successfully
13:48:22.389 Disk 0 MBR scan
13:48:22.389 Disk 0 Windows 7 default MBR code
13:48:22.405 Disk 0 Partition 1 00 DE Dell Utility MSDOS5.0 39 MB offset 63
13:48:22.405 Disk 0 Partition 2 80 (A) 07 HPFS/NTFS NTFS 15000 MB offset 81920
13:48:22.420 Disk 0 Partition 3 00 07 HPFS/NTFS NTFS 461899 MB offset 30801920
13:48:22.420 Disk 0 scanning C:\Windows\system32\drivers
13:48:30.106 Service scanning
13:48:45.878 Modules scanning
13:48:45.893 Disk 0 trace - called modules:
13:48:45.924 ntoskrnl.exe CLASSPNP.SYS disk.sys stdcfltn.sys iaStor.sys hal.dll
13:48:45.940 1 nt!IofCallDriver → \Device\Harddisk0\DR0[0xfffffa8005230060]
13:48:45.940 3 CLASSPNP.SYS[fffff88001bc243f] → nt!IofCallDriver → [0xfffffa80050e2c50]
13:48:45.956 5 stdcfltn.sys[fffff88001b02c52] → nt!IofCallDriver → \Device\Ide\IAAStorageDevice-1[0xfffffa8004f3e050]
13:48:48.732 AVAST engine scan C:\Windows
13:48:50.355 AVAST engine scan C:\Windows\system32
13:50:56.372 AVAST engine scan C:\Windows\system32\drivers
13:51:06.075 AVAST engine scan C:\Users\MY
13:51:35.060 AVAST engine scan C:\ProgramData
13:51:56.978 Scan finished successfully
13:52:09.364 Disk 0 MBR has been saved successfully to “C:\Users\MY\Documents\MBR.dat”
13:52:09.364 The log file has been saved successfully to “C:\Users\MY\Documents\aswMBR.txt”

C:\avast! sandbox that is why they are reported hidden … They are in the sandbox