My pc is slow can ...anyone help ?

I have built this a few months back and thought I had done all of the correct figures. However it seems to be slow and I am open to all advice. My boot time is almost 1min and 10 seconds. Here is my build specs:

Rosewill Xtreme Series RX750-D-B 750W Continuous
Item #: N82E16817182069
Microsoft Windows 7 Home Premium 64-bit
Item #: N82E16832116754
GIGABYTE GA-890GPA-UD3H AM3 AMD 890GX SATA 6Gb/s
Item #: N82E16813128435
VD Burner - Bulk Black SATA Model GH24NS50
Item #: N82E16827136177
Western Digital AV-GP WD-5000AVDS 500GB SATA
Item #: N82E16822136497
Western Digital AV-GP WD-1TG (Partioned 292gb,292gb & 345gb)
G.SKILL Ripjaws Series 8GB
Item #: N82E16820231276
SAPPHIRE 100287L Radeon HD 5670
Item #: N82E16814102870
AMD Athlon II X3 435 Rana 2.9GHz Socket AM3 95W Triple-Core
Item #: N82E16819103724 ( 4th core opened up reading as Phenom 2 x4 B35 )------
Antec Nine Hundred
Item #: N82E16811129021

I have approx $500 to spend for more equipment ( I was thinking of possibly a ssd for the os). The monitor will be replaced with a 27 or 32inch LCD Tv Screen not included on the price. This pc is mostly used for watching movies and television with minor games (my nephew plays Halo and Halo CE on it). I have Nero 2010,Microsoft Office 2010,AutoDesk 2011,ConvertXtoDvD,Google-Earth,TV-UPlayer just to name a few and also use Catalyst Media Center for Tv viewing. a total of 123 programs. Not to mention a few of these have conflicts with each other (who ever said xp programs will work with Windows 7). I also have two virtual drives.