the partition should be marked as active prior to the repair attempt, so that the repair is applied to the correct partition, or else you'll sometimes end up with more than one boot mbr and that not fun, but the scanner greg linked to is the one for the job if it's an infection
System Manufacturer/Model Number Custom self build - Desktop OS MS Windows 7 Home Premium SP1 64-bit (Family Pack Lic.) Upgrade CPU AMD Phenom II X6: Black Ed 1090T - AM3 / 3.2GHz / 8MB Motherboard Biostar TA790XE3 Memory 2 dual ch sets OCZ DDR3 PC3-10666 Platinum 1333MHz 8GB total Graphics Card Onboard Sound Card Onboard 5.1 channel HD Monitor(s) Displays SyncMaster "Legal-sized" LCD (rotatable) Screen Resolution unknown (8.5"x15")? pixels are not known
Keyboard Blue Star Ergonomic - ps/2 Mouse LED coorded w/v. roller wheel - ps/2 PSU Antec 900W mATX 20+4 w/6-8SATA;2MLX;4x6(+2)PCIe[p/n HCG-900] Case Mid 10-bay tower - free space design interior & well vented Cooling CPU HS cooler, 14.5" Case-sysfan1, dual sysfan2, exhaust Hard Drives HDD1: WD RE3 Enterprize [p/n: WD500ABYS-NDW]
________SATA-II (3Gb/s) 500GB/7200rpm/16MB
HDD2: Deskstar 7K1000.C [p/n: HDS721010CLA332]
________SATA-II (3Gb/s) 1TB/7200rpm/32MB Internet Speed GbLAN 10/100/1000 & WLAN - on T1 (Peer Network) Other Info Harmon-Karden speakers (L,R @ sub)
APC (Lead/Acid Batt backup UPC+Surge protector+etc)
Sony DVD SATA(300) - RW DVD/CD SATA-II(300)