No.. it is not destroyed.
Your Install apparently pissed off WIN.
Win from Dell or HP (Some others) partitions the HDD and puts a DIAG
partition in there for Remote Assist from Cust Support (India) should you
need it
Ubuntu assumes that the Partitions are Logically OS, Diag and Free
Your HDD is FULL, has only 2 parts and Now has 3.. so your BOOT.INI file is
pointing to the wrong partition now

Should look like this (Ubuntu prob changed disk() or Partition() values ;-)

[boot loader]
timeout=30 << << This is amt of time before OS continues with defaults
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS << << This is where WIN
is on New HDD It is the DEFAULT
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP
Professional" /noexecute=optin /fastdetect
To fix: Boot Knoppix or similar Unix-clone CDROM
Unprotect the HIDDEN, SYSTEM Boot.Ini file
Edit the Boot.Ini file
Save the new Boot.Ini file
Done.

To REPAIR a corrupt WINDOWS install....
Press F12 at boot time and HOLD it
Select Safe mode
Select Last Known Good

-or-

Press F12 at boot time and HOLD
Insert GOOD, Valid OS CDROM
Select Boot from CDROM or (L/R Bay)
Select Install Windows
Select Repair current installation
continue, ans Q&A for ~30 min
Reboot
Done.