Reinstalling LL after losing wifi due to installing updates

[AZ]

Linux Lite: 2.0
I'm trying to reinstall LL on my hard drive after losing wifi due to installing updates. When I go to install LL using the CD, I have the option to install LL alongside Windows XP. I've already installed LL alongside XP. I don't want two LL operating systems & XP installed. I want to reinstall LL over the existing LL. I believe, I have to delete one of the partitions (number 5) but it won't let me. I need to know which partition to delete. Below are my partitions on my hard drive. Any help would be much appreciated. Thanks

AZ

linux@linux:~$ sudo parted -l
Model: ATA WDC WD600UE-22KV (scsi)
Disk /dev/sda: 60.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start  End    Size    Type      File system    Flags
1      32.3kB  47.3GB  47.3GB  primary  ntfs            boot
2      47.3GB  60.0GB  12.7GB  extended
5      47.3GB  58.5GB  11.3GB  logical  ext4
6      58.5GB  60.0GB  1473MB  logical  linux-swap(v1)


Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0
has been opened read-only.
Error: Invalid partition table - recursive partition on /dev/sr0.       
Ignore/Cancel?