Upgrade Win XP Bootcamp partition to Win7?

I read the docs that says you cannot upgrade XP directly to Win 7 as it requires a 'clean install' from an external CD.
I have someone on ebay who purports to be selling me an upgrade CD that will do this
"The Win7 upgrade I'm selling will allow you to "upgrade" Windows XP by doing a clean install only. In-place upgrades are disabled unless upgrading from Vista Business. When running the upgrade DVD setup (either directly from Windows XP or by booting from the burned upgrade DVD), the setup will search for a previous installation of Windows. It will find XP and then allow you to perform a "clean" install so you will want to backup all of your personal files from Windows XP "
Does this sound right? My XP partition runs under Bootcamp and Parallels 6 seamlessly (just a bit slow and stilted though), and I wanted to try and get a modern 64bit OS so that it can use more than the 3G RAM that XP 32 allows.
1) Is it worth it? Will my windows environment see any signifacant performane increases? I have an 8G Ram 2007 i7 iMac and even under BootCamp, XP only sees 3G Ram.
2) IS it possible to do it as described above? IE boot from the external Win7 ISO CD, then 'upgrade' by detecting XP, re-formatting the partition and installing Win 7 (followed by using Snow Leopard CD to re-install BootCamp drivers.
3) Will this totally bugger up my Parallels installation? (Ie, can I just re-install parallels or when it runs, will it automatically upgrade. It will point to the same partition as the virtual machine - but that partition will have new software running on it.
- I am unsure if this is worth purchasing, or am I looking at screwing a pokey but functional install of Windows XP?

Brian Findlay wrote:
 I read the docs that says you cannot upgrade XP directly to Win 7 as it requires a 'clean install' from an external CD.
I have someone on ebay who purports to be selling me an upgrade CD that will do this
"The Win7 upgrade I'm selling will allow you to "upgrade" Windows XP by doing a clean install only. In-place upgrades are disabled unless upgrading from Vista Business. When running the upgrade DVD setup (either directly from Windows XP or by booting from the burned upgrade DVD), the setup will search for a previous installation of Windows. It will find XP and then allow you to perform a "clean" install so you will want to backup all of your personal files from Windows XP "
Does this sound right? My XP partition runs under Bootcamp and Parallels 6 seamlessly (just a bit slow and stilted though), and I wanted to try and get a modern 64bit OS so that it can use more than the 3G RAM that XP 32 allows.
1) Is it worth it? Will my windows environment see any signifacant performane increases? I have an 8G Ram 2007 i7 iMac and even under BootCamp, XP only sees 3G Ram.
2) IS it possible to do it as described above? IE boot from the external Win7 ISO CD, then 'upgrade' by detecting XP, re-formatting the partition and installing Win 7 (followed by using Snow Leopard CD to re-install BootCamp drivers.
3) Will this totally bugger up my Parallels installation? (Ie, can I just re-install parallels or when it runs, will it automatically upgrade. It will point to the same partition as the virtual machine - but that partition will have new software running on it.
- I am unsure if this is worth purchasing, or am I looking at screwing a pokey but functional install of Windows XP?
This is a clean install, no different from any other install of 7 over XP, you will need to backup all data and reinstall all applications.

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       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:      GUID_partition_scheme                        *160.0 GB   disk0
       1:                        EFI EFI                     209.7 MB   disk0s1
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    gpt show: /dev/disk0: Suspicious MBR at sector 0
    gpt show: /dev/disk0: Pri GPT at sector 1
    gpt show: /dev/disk0: Sec GPT at sector 312581807
          start       size  index  contents
              0          1         MBR
              1          1         Pri GPT header
              2         32         Pri GPT table
             34          6        
             40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
         409640  107421872      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
      107831512    1269544      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
      109101056   51138560        
      160239616  152340480      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
      312580096       1679        
      312581775         32         Sec GPT table
      312581807          1         Sec GPT header
    sudo fdisk /dev/disk0
    Disk: /dev/disk0 geometry: 19457/255/63 [312581808 sectors]
    Signature: 0xAA55
             Starting       Ending
    #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
    1: EE    0   0   2 - 1023 254  63 [         1 -  160239615] <Unknown ID>
    *2: 07 1023 254  63 - 1023 254  63 [ 160239616 -  152340480] HPFS/QNX/AUX
    3: 00    0   0   0 -    0   0   0 [         0 -          0] unused     
    4: 00    0   0   0 -    0   0   0 [         0 -          0] unused
    sudo dd if=/dev/rdisk0 count=1 2>/dev/null | hexdump -C
    00000000  33 c0 8e d0 bc 00 7c 8e  c0 8e d8 be 00 7c bf 00  |3.....|......|..|
    00000010  06 b9 00 02 fc f3 a4 50  68 1c 06 cb fb b9 04 00  |.......Ph.......|
    00000020  bd be 07 80 7e 00 00 7c  0b 0f 85 0e 01 83 c5 10  |....~..|........|
    00000030  e2 f1 cd 18 88 56 00 55  c6 46 11 05 c6 46 10 00  |.....V.U.F...F..|
    00000040  b4 41 bb aa 55 cd 13 5d  72 0f 81 fb 55 aa 75 09  |.A..U..]r...U.u.|
    00000050  f7 c1 01 00 74 03 fe 46  10 66 60 80 7e 10 00 74  |....t..F.f`.~..t|
    00000060  26 66 68 00 00 00 00 66  ff 76 08 68 00 00 68 00  |&fh....f.v.h..h.|
    00000070  7c 68 01 00 68 10 00 b4  42 8a 56 00 8b f4 cd 13  ||h..h...B.V.....|
    00000080  9f 83 c4 10 9e eb 14 b8  01 02 bb 00 7c 8a 56 00  |............|.V.|
    00000090  8a 76 01 8a 4e 02 8a 6e  03 cd 13 66 61 73 1c fe  |.v..N..n...fas..|
    000000a0  4e 11 75 0c 80 7e 00 80  0f 84 8a 00 b2 80 eb 84  |N.u..~..........|
    000000b0  55 32 e4 8a 56 00 cd 13  5d eb 9e 81 3e fe 7d 55  |U2..V...]...>.}U|
    000000c0  aa 75 6e ff 76 00 e8 8d  00 75 17 fa b0 d1 e6 64  |.un.v....u.....d|
    000000d0  e8 83 00 b0 df e6 60 e8  7c 00 b0 ff e6 64 e8 75  |......`.|....d.u|
    000000e0  00 fb b8 00 bb cd 1a 66  23 c0 75 3b 66 81 fb 54  |.......f#.u;f..T|
    000000f0  43 50 41 75 32 81 f9 02  01 72 2c 66 68 07 bb 00  |CPAu2....r,fh...|
    00000100  00 66 68 00 02 00 00 66  68 08 00 00 00 66 53 66  |.fh....fh....fSf|
    00000110  53 66 55 66 68 00 00 00  00 66 68 00 7c 00 00 66  |SfUfh....fh.|..f|
    00000120  61 68 00 00 07 cd 1a 5a  32 f6 ea 00 7c 00 00 cd  |ah.....Z2...|...|
    00000130  18 a0 b7 07 eb 08 a0 b6  07 eb 03 a0 b5 07 32 e4  |..............2.|
    00000140  05 00 07 8b f0 ac 3c 00  74 09 bb 07 00 b4 0e cd  |......<.t.......|
    00000150  10 eb f2 f4 eb fd 2b c9  e4 64 eb 00 24 02 e0 f8  |......+..d..$...|
    00000160  24 02 c3 49 6e 76 61 6c  69 64 20 70 61 72 74 69  |$..Invalid parti|
    00000170  74 69 6f 6e 20 74 61 62  6c 65 00 45 72 72 6f 72  |tion table.Error|
    00000180  20 6c 6f 61 64 69 6e 67  20 6f 70 65 72 61 74 69  | loading operati|
    00000190  6e 67 20 73 79 73 74 65  6d 00 4d 69 73 73 69 6e  |ng system.Missin|
    000001a0  67 20 6f 70 65 72 61 74  69 6e 67 20 73 79 73 74  |g operating syst|
    000001b0  65 6d 00 00 00 63 7b 9a  e9 54 00 00 00 00 00 00  |em...c{..T......|
    000001c0  02 00 ee fe ff ff 01 00  00 00 ff 0f 8d 09 80 fe  |................|
    000001d0  ff ff 07 fe ff ff 00 10  8d 09 00 88 14 09 00 00  |................|
    000001e0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
    000001f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 55 aa  |..............U.|
    00000200

    I've included the updated output for the last command
    00000000  57 ac 81 37 d5 fe 20 bc  c8 1b 93 fe 7f eb 7d bf  |W..7.. .......}.|
    00000010  f9 eb fb 78 ab e6 4f 23  34 67 cc ff 00 98 57 14  |...x..O#4g....W.|
    00000020  1c db cc b7 bf 64 8d bf  78 ff 00 e4 db 7f d4 4f  |.....d..x......O|
    00000030  fd 20 4b fe e4 22 55 17  78 de b7 9f 74 c8 96 35  |. K.."U.x...t..5|
    00000040  55 b5 87 d6 6e 7c 78 f1  f4 a7 e1 fb 11 fe ef 84  |U...n|x.........|
    00000050  a9 fd ec 52 c5 ff 00 2e  11 7f bc b8 aa c8 12 33  |...R...........3|
    00000060  f9 95 2d c3 06 fd cd 9b  43 ca ac df 17 08 9f fd  |..-.....C.......|
    00000070  7e 7c e5 ff 00 75 4b 2c  9e af fd 2c 3d 5f f4 fc  |~|...uK,...,=_..|
    00000080  55 96 ff 00 a3 84 6e 2e  cd 1b 2f 2e ab c7 8f 1f  |U.....n.../.....|
    00000090  b1 cf 87 a7 c3 83 ff 00  be bd 2f 4f fd d5 f5 5f  |........../O..._|
    000000a0  f7 15 2a ad de 1e 0c f3  48 65 3e 99 e5 23 14 66  |..*.....He>..#.f|
    000000b0  93 97 3f b3 f6 f9 f3 f5  f8 27 ee a5 fa cc b7 3c  |..?......'.....<|
    000000c0  3f 7b fa 4b d2 bf 89 57  99 6b 7a cc f6 3e 8f 98  |?{.K...W.kz..>..|
    000000d0  2d a1 1c b4 7d 42 cf 52  40 91 a3 28 8e 19 7e 2f  |-...}B.R@..(..~/|
    000000e0  ee 7d 38 fd 3f ab 3c b2  ff 00 a3 ff 00 ba bf 7b  |.}8.?.<........{|
    000000f0  17 fa 2f ab 2e 2a fa 03  f3 5a f2 e2 cb f2 e7 59  |../..*...Z.....Y|
    00000100  7b 50 27 96 ea cd ac 2d  3d 05 ab 17 bd 64 b4 84  |{P'....-=....d..|
    00000110  a0 43 56 6f df fe c2 7f  c6 2e 1f 65 d5 4e ad a2  |.CVo.......e.N..|
    00000120  b3 d3 ec a0 b1 8f 80 b4  b4 8a 38 23 40 aa bc 63  |..........8#@..c|
    00000130  8e 2e 09 44 fb 28 9c 15  bf e2 bf 4f 9f fb ab d5  |...D.(.....O....|
    00000140  96 25 55 ee a4 09 e9 2c  80 fb 53 96 e7 97 fc 1f  |.%U....,..S.....|
    00000150  db a7 fc 59 ea f0 ff 00  76 fa 49 70 aa c9 26 31  |...Y....v.Ip..&1|
    00000160  38 d8 50 d3 e1 1e e2 9f  2f e7 fd af 4f e1 7f 8b  |8.P...../...O...|
    00000170  d2 f5 5e dd 55 49 26 01  e3 48 d4 f1 6d cd 0f 56  |..^.UI&..H..m..V|
    00000180  ff 00 89 fe da 7f c2 ff  00 c5 51 4e aa 43 e6 76  |..........QN.C.v|
    00000190  9a e7 5c f2 ad b7 a6 44  6f ac a4 a1 a9 fe f9 b2  |..\....Do.......|
    000001a0  bb 9b c4 7f 27 fd 77 fb  d8 ad d5 53 fc e2 d2 74  |....'.w....S...t|
    000001b0  cd 47 ca 2d 26 a3 01 b8  b5 d2 ae ad 75 2b 98 83  |.G.-&.......u+..|
    000001c0  88 ab 04 12 81 73 c9 f9  c5 c4 0b 56 b8 7f ef 62  |.....s.....V...b|
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    000001e0  b3 49 6d 73 f5 74 16 b7  93 7d 6a dd 16 d6 45 96  |.Ims.t...}j...E.|
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